Patent Publication Number: US-9849354-B2

Title: Club head sets with varying characteristics and related methods

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This patent application is a continuation application of U.S. patent application Ser. No. 13/096,944, filed on Apr. 28, 2011. Meanwhile, U.S. patent application Ser. No. 13/096,944 is a continuation-in-part application of (i) U.S. patent application Ser. No. 12/791,734, (now U.S. Pat. No. 8,690,710) filed on Jun. 1, 2010, (ii) U.S. patent application Ser. No. 12/791,738, (now U.S. Pat. No. 8,574,094) filed on Jun. 1, 2010, and (iii) U.S. patent application Ser. No. 12/791,740, (now U.S. Pat. No. 8,657,700) filed on Jun. 1, 2010, each of which claim the benefit of U.S. Provisional Patent Application No. 61/323,349, filed on Apr. 12, 2010, and each of which are continuation-in-part applications of U.S. patent application Ser. No. 11/828,260, (now abandoned) filed on Jul. 25, 2007. U.S. patent application Ser. No. 13/096,944 also claims the benefit of U.S. Provisional Patent Application No. 61/453,904, filed on Mar. 17, 2011. 
     U.S. patent application Ser. No. 13/096,944, U.S. patent application Ser. No. 12/791,734, U.S. patent application Ser. No. 12/791,738, U.S. patent application Ser. No. 12/791,740, U.S. Provisional Patent Application No. 61/323,349, U.S. patent application Ser. No. 11/828,260, and U.S. Provisional Patent Application No. 61/453,904 each are incorporated herein by reference. 
    
    
     TECHNICAL FIELD 
     This disclosure relates generally to sports equipment, and relates more particularly to club heads and related methods. 
     BACKGROUND 
     Golf clubs and specifically golf club heads of various designs have typically been developed to improve a person&#39;s golf swing and resulting golf shot. In particular, many people are unable to hit or lack consistency when hitting “down” on a ball, that is, to regularly hit the ball squarely. Golf club designs and, particularly, golf club head designs may optimize a golf club head&#39;s weighting scheme, such as the golf club head&#39;s center of gravity position and moments of inertia. Such designs may mitigate a person&#39;s inconsistency problems. Back weighting and/or an additional lower toe weighting may strategically position the center of gravity and may induce the person during his swing to hit “down” on the ball, thus, hitting the ball squarely. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  illustrates an exploded view of an exemplary golf club head according to an embodiment of the golf clubs and methods of manufacture described herein; 
         FIG. 2  illustrates a front view of the exemplary golf club head of  FIG. 1 ; 
         FIG. 3  illustrates an exploded, cross-sectional view of the exemplary golf club head, taken from a section line  3 - 3  in  FIG. 1 ; 
         FIG. 4  illustrates an exploded, cross-sectional view of the exemplary golf club head, taken from a section line  4 - 4  in  FIG. 1 ; 
         FIG. 5  illustrates a perspective view of the exemplary golf club head of  FIG. 1 ; 
         FIG. 6  depicts a flow diagram representation of one manner in which a golf club head may be manufactured; 
         FIG. 7  depicts a flow diagram representation of one manner in which a golf club may be manufactured; 
         FIG. 8  presents a rear view of a club head of a club head set with varying characteristics according to an embodiment of the golf clubs and methods of manufacture described herein; 
         FIG. 9  presents a toe side view of the club head of  FIG. 8 ; 
         FIG. 10  illustrates a rear view of a body of the club head of  FIG. 8 , where the club head is in a disassembled state; 
         FIG. 11  illustrates a rear view of a body of another club head of the club head set of the club head of  FIG. 8 , where the club head is in a disassembled state; 
         FIG. 12  illustrates a rear view of a body of yet another club head of the club head set of the club head of  FIG. 8 , where the club head s in a disassembled state; 
         FIG. 13  illustrates a cross-sectional view of the club head of  FIGS. 8 and 10  along a line  13 - 13  of  FIG. 10 ; 
         FIG. 14  illustrates a cross-sectional view of the club head of  FIG. 11  along a line  14 - 14  of  FIG. 11 ; 
         FIG. 15  illustrates a cross-sectional view of the club head of  FIG. 12  along a line  15 - 15  of  FIG. 12 ; 
         FIG. 16  illustrates a chart of an exemplary relationship between support bar width relative to loft angle for the exemplary club head set of  FIGS. 8-15 ; 
         FIG. 17  illustrates several club heads of a club head set with varying characteristics according to an embodiment of the golf clubs and methods of manufacture described herein; 
         FIG. 18  illustrates a cross-sectional view of the club head of  FIG. 8  along line  18 - 18  from  FIG. 8 ; 
         FIG. 19  illustrates a chart of exemplary relationship between loft angle and distances between lower toe inserts to front faces for the exemplary club heads of  FIGS. 8-18  according to an embodiment of the golf clubs and methods of manufacture described herein; 
         FIG. 20  illustrates a flowchart of a method for providing a club head set similar to the club head sets described for  FIGS. 8-19 ; 
         FIG. 21  illustrates a flowchart of another method for providing a club head set similar to the club head sets described for  FIGS. 8-19  according to an embodiment of the golf clubs and methods of manufacture described herein; 
         FIG. 22  illustrates a chart with sample ranges for relationships between the support bar widths and the loft angles/club head numbers; 
         FIG. 23  illustrates a chart with sample ranges for relationships between the distances from the lower toe inserts to the club head front faces and the loft angles/club head numbers; and 
         FIG. 24  illustrates a flowchart of a method for providing a club head similar to the club head shown in  FIGS. 8-10, 13, and 18 . 
         FIG. 25  illustrates a rear view of a club head of a club head set with varying characteristics according to an embodiment of the golf clubs and methods of manufacture described herein. 
         FIG. 26  illustrates a rear view of another club head of the club head set of  FIG. 25 . 
         FIG. 27  illustrates a rear view of yet another club head of the club head set of  FIG. 25 . 
         FIG. 28  illustrates a top “x-ray” view of the club head of  FIG. 25  poised to strike a golf ball. 
         FIG. 29  illustrates a rear view of a club head similar to that of  FIG. 25  and with a varying stabilizing bar. 
         FIG. 30  illustrates a rear view of a club head similar to that of  FIG. 25  and with a plurality of stabilizing bars. 
         FIG. 31  illustrates a flowchart of a method for providing a club head set in accordance with  FIGS. 25-30 . 
     
    
    
     For simplicity and clarity of illustration, the drawing figures illustrate the general manner of construction, and descriptions and details of well-known features and techniques may be omitted to avoid unnecessarily obscuring the golf clubs and their methods of manufacture. Additionally, elements in the drawing figures are not necessarily drawn to scale. For example, the dimensions of some of the elements in the figures may be exaggerated relative to other elements to help improve understanding of embodiments of the golf clubs and their methods of manufacture. The same reference numerals in different figures denote the same elements. 
     The terms “first,” “second,” “third,” “fourth,” and the like in the description and in the claims, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of golf clubs and methods of manufacture described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms “contain,” “include,” and “have,” and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to those elements, but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. 
     The terms “left,” “right,” “front,” “back,” “top,” “bottom,” “side,” “under,” “over,” and the like in the description and in the claims, if any, are used for descriptive purposes and not necessarily for describing permanent relative positions. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of golf clubs and methods of manufacture described herein are, for example, capable of operation in other orientations than those illustrated or otherwise described herein. The term “coupled,” as used herein, is defined as directly or indirectly connected in an electrical, physical, mechanical, or other manner. 
     DESCRIPTION 
     In one embodiment of the golf clubs and methods of manufacture described herein, a golf club head comprises a body having a toe region, a heel region opposite the toe region, a sole region, and a top region opposite the sole region. The golf club head further comprises a front face, a first back opposite the front face, a second back opposite the front face and extending farther from the front face than the first back. The second back extends from the heel region to the toe region, and extends from the sole region to about a midpoint between the sole region and the top region. The golf cub head further comprises a first cavity between the first back and the second back, and a second cavity integral with the second back at the toe region. This embodiment may further comprise a first weight that is inserted in the first cavity and a second weight inserted in the second cavity. 
     In another embodiment of golf clubs and methods of manufacture, a golf club head comprises a body comprising a front face, a heel region, a toe region opposite the heel region, and a sole. The sole extends from the heel region to the toe region, and the sole extends from the front face to a back sole edge. The golf club head further comprises a top opposite the sole, and a first back opposite the front face and substantially parallel to the front face. The first back extends from the heel region to the toe region, and extends from a midpoint between the sole and the top, to the top. The golf club head further comprises a second back opposite the front face extending from the back sole edge to about the midpoint. The golf club head further comprises a rectangular first cavity between the second back and the front face, and a second cavity integral with the second back at the toe region. This embodiment may further comprise a first weight that is inserted in the first cavity and a second weight inserted in the second cavity. 
     In another embodiment of golf clubs and methods of manufacture, a golf club comprises a golf club head described herein and coupled to a shaft. The golf club further comprises a hosel ratio of 0.75 wherein, the hosel ratio comprises a hosel distance to a front face distance. The hosel distance extends from a point at the heel region to a second end opposite the first end, and the front face distance comprises a distance measured along the front face from the point to a toe edge and substantially parallel to the sole. The golf club may further comprise a first weight to occupy the first cavity and a second weight to occupy the second cavity. 
     In an embodiment of golf clubs and methods of manufacture, a method for manufacturing a golf club head comprises providing a body having a toe region, a heel region opposite the toe region, a sole region, and a top region opposite the sole region. This embodiment further comprises a front face, a first back opposite the front face, a second back opposite the front face and extending farther from the front face than the first back. The second back extends from the heel region to the toe region, and extends from the sole region to about a midpoint between the sole region and the top region. The body is further provided to comprise a first cavity between the first back and the second back, and a second cavity integral with the second back at the toe region. This embodiment may further comprise providing a first weight that is inserted in the first cavity and providing a second weight inserted in the second cavity. 
     There can be examples in accordance with the present disclosure where a club head set can comprise two or more club heads, each comprising a loft angle, a front face, a back face opposite the front face, and one or more support bars protruded from the back face. The loft angle can be incrementally varied across the two or more club heads, and a characteristic of the one or more support bars is incrementally varied across the two or more club heads as the loft angle is incrementally varied across the two or more club heads. 
     There also can be examples in accordance with the present disclosure where a club head set can comprise first and second club heads. The first club head can comprise a first loft angle, a first front face, and a first back portion comprising a first heel region, a first toe region, a first back face opposite the first front face and extended between the first heel and toe regions, and one or more first support bars coupled to the first back face. The second club head can comprise a second loft angle, a second front face, and a second back portion comprising a second heel region, a second toe region, a second back face opposite the second front face and extended between the second head and toe regions, and one or more second support bars coupled to the second back face. In such examples, the first loft angle is greater than the second loft angle, and an attribute of the one or more first support bars is greater than an attribute of the one or more second support bars. 
     There also can be examples in accordance with the present disclosure where a method can comprise providing a club head set. Providing the club head set can comprise providing a first club head, the first club head comprising a first loft angle, a first front face, and a first back portion comprising, a first heel region, a first toe region, a first back face opposite the first front face and extended between the first heel and toe regions, and one or more first support bars coupled to the first back face, the one or more first support bars comprising a first support bar characteristic. Providing the club head set can also comprise providing a second club head, the second club head comprising a second loft angle, a second front face and a second back portion comprising a second heel region, a second toe region, a second back face opposite the second front face and extended between the second heel and toe regions, and one or more second support bars coupled to the second back face, the one or more second support bars comprising a second support bar characteristic. In such examples, providing the first club head comprises providing the first loft angle to be greater than the second loft angle, and providing the first support bar characteristic to be greater than the second support bar characteristic. 
     There also can be examples in accordance with the present disclosure where a club head set can comprise two or more club heads, each comprising a loft angle, a front face, and a backside comprising a back face opposite the front face, and a weight located only at a lower toe section of the backside. In such examples, the loft angle can be varied across the two or more club heads, a first characteristic of the weight can be varied across the two or more club heads, a second characteristic of the weight can be varied across the two or more club heads, and the first and second characteristics can be inversely varied relative to each other. 
     There also can be examples in accordance with the present disclosure where a club head set can comprise first and second club heads. The first club head can comprise a first loft angle, a first front face, and a first back portion that comprises a first heel region, a first toe region comprising a first lower toe section, and a first back face opposite the first front face and extended between the first heel and first toe regions. The second club head can comprise a second loft angle, a second front face, and a second back portion that comprises a second heel region, a second toe region comprising a second lower toe section, and a second back face opposite the second front face and extended between the second heel and second toe regions. The first club head can also comprise a first weight at the first lower toe section of the first toe region, and the second club head can also comprise a second weight at the second lower toe section of the second toe region. In such examples, the first loft angle can be greater than the second loft angle, the first and second weights can comprise substantially similar masses, the first and second weights each comprise first dimensions corresponding to each other, and the first and second weights each comprise second dimensions corresponding to each other. When the first dimension of the first weight is greater than the first dimension of the second weight, the second dimension of the second weight can be greater than the second dimension of the first weight. When the second dimension of the first weight is greater than the second dimension of the second weight, the first dimension of the second weight can be greater than the first dimension of the first weight. 
     There also can be examples in accordance with the present disclosure where a method can comprise providing a club head set. Providing the club head set can comprise providing a first club head of the club head set, and providing a second club head of the club head set. The first club head can comprise a first loft angle, a first front face, and a first back portion comprising a first back face opposite the first front face and extended between heel and toe regions of the first back portion and a first lower toe section comprising a first cavity. The second club head can comprise a second loft angle, a second front face, and a second back portion comprising a second back face opposite the second front face and extended between heel and toe regions of the second back portion, and a second lower toe section comprising a second cavity. Providing the first club head can comprise providing a first weight at the first cavity, and providing the first loft angle to be greater than the second loft angle. Providing the second club head can comprise providing a second weight at the second cavity. Providing the first weight can comprise providing a first length, a first width, and a first depth of the first weight. Providing the second weight can comprises providing a second length and a second width of the second weight such that at least one of the second length of the second weight is greater than the first length of the first weight, or the second width of the second weight is greater than the first width of the first weight. Providing the second weight can also comprise providing a second depth of the second weight such that the first depth of the first weight is greater than the second depth of the second weight. 
     There also can be examples in accordance with the present disclosure where a golf club head can comprise a front face and a back portion. The back portion can comprise a heel region, a toe region, a center region between the heel and toe regions, a back end extended between the heel and toe regions, and a cavity. The cavity can comprise a cavity heel zone, a cavity toe zone, a cavity center zone between the cavity heel and toe zones, a cavity inner section located towards the front face, and a cavity outer section located towards the back end. The cavity can be wider at the cavity center zone than at the cavity heel and toe zones. 
     There also can be examples in accordance with the present disclosure where a method can comprise providing an insert for a golf club head and/or providing a body of a club head. Providing the insert can comprise providing insert heel and toe zones, and providing an insert center zone between the insert heel and toe zones that is thicker than the insert heel and toe zones. Providing the body can comprise providing a back face and a back end at a back portion of the body, and providing a cavity between the back face and the back end. The cavity can comprise a cavity inner section adjacent to the back face, a cavity outer section opposite the back end, cavity heel and toe zones, and a cavity center zone between the cavity heel and toe zones that is thicker than the cavity heel and toe zones. The insert can be provided to be at least partially housed in the cavity. 
     There also can be examples in accordance with the present disclosure where a golf club head can comprise a back portion of a body of the club head, and an insert. The back portion can comprise a heel region, a toe region, a center region between the heel and toe regions, a back surface opposite the front face and extended between the heel and toe regions, a back wall extended between the heel and toe regions, and a cavity located between the back surface and the back wall. The cavity can comprise a cavity heel zone, a cavity toe zone, a cavity center zone between the cavity heel and toe zones, a cavity inner wall comprising a portion of the back surface, and a cavity outer wall located opposite the back wall. The insert can comprise an insert heel zone, an insert toe zone, an insert center zone between the insert heel and toe zones, an insert inner wall complementary to the cavity inner wall, and an insert outer wall complementary to the cavity outer wall. The golf club head can comprise a moment of inertia about the center region. The insert can be configured to be at least partially housed in the cavity. The cavity can be wider, from the cavity inner wall to the cavity outer wall, at the cavity center zone than at the cavity heel and toe zones. The insert can be wider, from the insert inner wall to the insert outer wall, at the insert center zone than at the insert heel and toe zones. A distribution of mass of the cavity inner wall can be concentrated at the cavity center zone. A distribution of mass of the insert can be shifted away from the insert heel and toe zones and towards the insert center zone. A density of a body of the golf club head can be greater than a density of the insert. A first portion of the moment of inertia contributed by the body of the club head at the cavity heel and toe zones can be greater than a second portion of the moment of inertia contributed by the insert at the insert heel and toe zones. The insert heel and toe zones can be obtusely angled relative to each other about the insert center zone and along the insert inner wall. The cavity inner wall can be obtusely angled complementarily to the insert inner wall. The insert can comprise a grip portion to aid during removal of the insert from the cavity, where the grip portion can be configured to remain external to the cavity when the insert is housed in the cavity. 
     There also can be examples in accordance with the present disclosure where a golf club head set can comprise a first club head comprising a first strike face, a first back face opposite the first strike face, a first top end, a first bottom end opposite the first top end, a first toe end, a first toe region comprising the first toe end, a first heel end opposite the first toe end, a first heel region comprising the first heel end, and a first vertical axis extended substantially perpendicularly through the first top end and the first bottom ends, and extended between the first heel and first toe regions. The first back face can comprise a first cavity located at the toe region and comprising a first cavity base and a first cavity wall bounding at least a portion of the first cavity base. The first back face can also comprise a first bar comprising a first bar axis extending along a length of the first bar. The first bar can be protruded from the first cavity base and extend diagonally, relative to the first vertical axis, across at least a first portion of the first cavity. The first bar axis can intersect the first vertical axis and extend therefrom towards the first toe end and the first top end. 
     There also can be examples in accordance with the present disclosure where a golf club head set can comprise a first club head comprising a first strike face, a first back face opposite the first strike face, a first top end, a first bottom end opposite the first top end, a first toe end, a first toe region comprising the first toe end, a first heel end opposite the first toe end, a first heel region comprising the first heel end, and a first vertical axis extended substantially perpendicularly through the first top end and the first bottom end and extended between the first heel region and the first toe region. The first back face can comprise a first cavity located at the toe region and comprising a first cavity base and a first cavity wall bounding the first cavity base. The first back face can also comprise a first bar protruded from the first cavity base, angled at a first bar angle relative to the first vertical axis, and extending across the first cavity. The first back face can also comprise a first hourglass support protruded from the first back face and comprising top and bottom portions a middle portion narrower than the top and bottom portions, and heel and toe sidewalls defining the top, middle, and bottom portions of the first hourglass support therebetween. The toe sidewall of the first hourglass support can protrude above the first cavity base. The first cavity wall can comprise the toe sidewall of the first hourglass support. 
     There also can be examples in accordance with the present disclosure where a method for providing a golf club head set can comprise providing a first club head of one or more club heads comprising diagonal stabilizing bars. A first vertical axis can extend through a first top end and a first bottom end of the first club head, and between a first heel region and a first toe region of the first club head. Providing the first club head can comprise providing a first back face opposite a first strike face of the first club head, providing a first cavity at the first back face and the first toe region, and providing a first bar within and protruded from the first cavity. The first bar can comprise a first bar axis extending along a length of the first bar. The diagonal stabilizing bars of the one or more club heads can comprise the first bar. Providing the first cavity can comprise providing a first cavity base, and providing a first cavity wall bounding the first cavity base. Providing the first bar can comprise aligning the first bar diagonally at a first bar angle relative to the first vertical axis such that the first bar axis intersects the first vertical axis and extends therefrom towards a first toe end and the first top end of the first club head. 
     Some embodiments include a golf club head. The golf club head comprises a strike face, a back face opposite the strike face, a top end, a bottom end opposite the top end, a toe end, a toe region comprising the toe end, a heel end opposite the toe end, and a heel region comprising the heel end. Further, the golf club head comprises a vertical axis. The vertical axis extends substantially perpendicularly to a horizontal centerline of the back face, is located approximately mid-way between the toe end and the heel end, extends through the top end and the bottom end, and demarcates the heel region from the toe region. Further still, the golf club head comprises a perimeter weight at the back face extending away from the strike face and along at least the top end and the bottom end of the club head. Also, the golf club head comprises an hourglass support at the back face traversing the vertical axis and extending between the perimeter weight at the top end and the perimeter weight at the bottom end. The hourglass support comprises top and bottom hourglass portions, a middle hourglass portion narrower than the top and bottom hourglass portions, and heel and toe hourglass sidewalls defining the top, middle, and bottom hourglass portions of the hourglass support therebetween. In these embodiments, the middle hourglass portion can be located above the horizontal centerline to raise a center of gravity of the golf club head, and/or the top hourglass portion can be wider and/or thicker than the bottom hourglass portion to raise the center of gravity of the golf club head. Further in these or other embodiments, the golf club head can be part of a set of golf club heads. Other examples and embodiments are further disclosed herein. Such examples and embodiments may be found in the figures, in the claims, and/or in the description of the present application. 
     Turning now to the figures,  FIG. 1  illustrates a rear, exploded perspective view of an exemplary golf club head  100  according to an embodiment of golf clubs and methods of manufacture, and  FIG. 2  illustrates a front view of the golf club head  100 . In one embodiment of the golf clubs and methods of manufacture described herein, the golf club head  100  comprises a body  101  having a toe region  110 , a heel region  120  opposite the toe region  110 , a hosel  105  at the heel region  120 , a sole region  130 , and a top region  140  opposite the sole region  130 . The sole region  130  may extend from the heel region  120  to the toe region  110 , and the sole region  130  may extend from a front face  250  ( FIG. 2 ) to a back sole edge  165 . In a different embodiment, the golf club head  100  may have a bore (not shown), instead of the hosel  105 , at the heel region  120 . 
     The golf club head  100  further comprises a first back  160  ( FIG. 1 ) opposite the front face  250  ( FIG. 2 ), a second back  170  ( FIG. 1 ) opposite the front face  250  ( FIG. 2 ) and extending farther from the front face  250  ( FIG. 2 ) than the first back  160  ( FIG. 1 ), as explained in more detail hereinafter. The first back  160  may be substantially parallel to the front face  250  ( FIG. 2 ) and the first back  160  may extend from the heel region  120  to the toe region  110 . The first back  160  may also extend from the sole  130  to a midpoint  115  ( FIG. 1 ) between the sole region  130  and the top region  140 , and may further extend from the midpoint  115  to the top region  140 . The second back  170  ( FIG. 1 ) may extend from the heel region  120  to the toe region  110 , and may extend from the sole region  130  to about the midpoint  115  ( FIG. 1 ) between the sole region  130  and the top region  140 , as can be seen in  FIGS. 1 and 5 . In a different embodiment, back face  170  ( FIG. 1 ) may extend from the sole region  130  beyond the midpoint  115 , or the back face  170  may extend from the sole region  130  below the midpoint  115 . 
     As illustrated in  FIGS. 1 and 3 , the golf club head  100  further comprises a first cavity  180  between the first back  160  and the second back  170 . As illustrated in  FIG. 3 , the first cavity  180  separates the first back  160  from the second back  170 , and vice versa. According to the various embodiments described herein, the golf clubs and methods of manufacture comprise the first cavity  180  to have a rectangular shape, but other configurations are contemplated. For example, the first cavity  180  may comprise an irregular shape, or a different regular shape, for example, triangular, circular, octagonal, hexagonal, and the like. In another example, the first cavity  180  may comprise a symmetrical shape or an asymmetrical shape. Moreover, the first cavity  180  may comprise various dimensions. 
     As illustrated in  FIGS. 1 and 4 , the golf club head  100  also comprises a second cavity  190  integral with the second back  170  at the lower toe region  110 . Similar to the first cavity  180 , the second cavity  190  may also comprise various shape and dimensional configurations. The shape and dimensional of the first cavity  180  and the second cavity  190  may be determined by the variables that optimize the utility of the golf club head  100 , and to adjust the moments of inertia, the center of gravity, and the like. Also, the golf clubs and methods of manufacture described herein, may further comprise cavities that vary in volume, and the volume may depend upon the desired design of the golf club head. Although the above examples may describe two cavities (e.g., the first and second cavities  180  and  190 ), the golf clubs and methods of manufacture described herein may include additional cavities. 
     This embodiment of golf club head  100  may further comprises a first weight  185  that is inserted in the first cavity  180  and a second weight  195  that is inserted in the second cavity  190 . According to the various embodiments described herein, first weight  185  and second weight  195  may comprise various shapes and dimensional configurations. For example, the first weight  185  and the second weight  195  may comprise shapes and dimensions that are complimentary to the respective cavities into which they are inserted (e.g., the first and second cavities  180  and  190 , respectively). In another example, the first weight  185  and the second weight  195  may comprise shapes that only partially occupy the cavities into which they are inserted, or the first weight  185  and the second weight  195  may comprise shapes that overfill the first and second cavities  180  and  190 , respectively. The first weight  185  and the second weight  195  can comprise various materials. In one embodiment, the first weight  185  comprises a metal matrix material. In another embodiment, the first weight  185  comprises a polymer, and may be either a thermoset or thermoplastic polymer. First weight  185  may comprise a specific gravity of approximately 1 g/cm 3  (grams per cubed centimeter) to approximately 9 g/cm 3  in some examples. The second weight  195  may comprise a metal, and may be either a single elemental metal such as iron, or a metal alloy, such as tungsten or titanium alloy. In this embodiment, the first weight  185  comprises a metal matrix material because it generally provides the ability to adjust the back weighting more so than the lightest, or least dense metal or metal alloy, and the second weight  195  comprises a metal because an outer toe weight may be beneficial to induce a golfer to swing “downwardly” and “outwardly.” In another embodiment, the first weight  185  and the second weight  195  may comprise of the same material, such as a polymer, a composite, a metal, or a metal alloy. The body  101  can comprise standard golf club head materials such as iron, iron alloys, titanium alloys, and the like, and the first weight  185  and the second weight  195  can comprise the same or different materials as the body  101 . As with the shape determination for the first and second cavities, the material determination may be similarly dependant upon the variables that maximize the utility of the golf club head, and other material configurations other than those specifically described are contemplated. 
     In another embodiment of golf clubs and methods of manufacture, and with reference to  FIG. 2  a golf club  200  comprises the golf club head  100  coupled to a shaft  208 . In this embodiment, the golf club  200  may further comprise a hosel ratio of 0.75. The hosel ratio comprises a hosel distance  203  to a front face distance  253 . The hosel distance  203  measures from a first end  206  at about the heel region  120  to a second end  207  opposite the first end  206 . The first end  206  is located at a point  204  where a linear portion of the hosel  105  begins to curve into the front face  250 . The front face distance  253  comprises the distance measured along the front face  250  from the point  204  to a toe edge  211  and substantially parallel to the sole  130 . The golf club  200  may further comprise, for example as shown in  FIG. 1 , the first weight  185  to occupy the first cavity  180  and the second weight  195  to occupy the second cavity  190 . 
     The golf club  200 , as described herein with the cavities and inserted weights of the golf club head  100 , provides for an exemplary golf club that assists a golfer to improve his or her golf swing by allowing for customization of the back weight and toe weight in the club head  100 . Furthermore, among the various embodiments described herein, the golf clubs and their methods of manufacture may be for irons, drivers, fairway woods, hybrids, putter, and or other suitable types of clubs. 
     In an embodiment of golf clubs and methods of manufacture, a method  600  for manufacturing a golf club head comprises providing a golf club head (a block  610 ). The golf club head of the block  610  may be similar to the golf club head  100  shown in  FIGS. 1-5 . Method  600  further comprises determining a first weight (a block  620 ), securing the first weight in a first cavity (a block  630 ), determining a second weight (a block  640 ), and securing the second weight in a second cavity (a block  650 ). As an example, the first weight of the block  620  may be similar to the first weight  185  of  FIG. 1 , and the second weight of the block  640  may be similar to the second weight  195  of  FIG. 1 . 
     Furthermore, the determining step in the block  620  may include having a professional golf technician analyze a golfer&#39;s swing. Depending on the swing analyzed by the professional golf technician, a lighter or heavier weight may be determined. Similarly, the determining step in the block  640  may likewise include determining whether to use a lighter or heavier weight based upon analysis of a golfers swing by a professional golf technician. In addition or alternatively, software, firmware, and/or hardware may be used to determine the first weight (e.g., monitor, measure, and/or analyze various parameters associated with an individual&#39;s golf swing). 
     In an embodiment of golf clubs and methods of manufacture, a method  700  for manufacturing a golf club, comprises providing a golf club head (the block  610 ), determining a first weight (the block  620 ), securing the first weight in a first cavity (the block  630 ), determining a second weight (the block  640 ), securing the second weight in a second cavity (the block  650 ), and coupling the body to a golf club shaft (a block  760 ). As an example, the shaft of the block  760  may be similar to the shaft  208  of  FIG. 2 . Also, the coupling step of the block  760  can include taping, adhering, welding, swaging, or other suitable techniques. 
     According to the method embodiments described herein, the method for securing the first and/or second weight(s) comprises any process to secure the weights in their respective cavities. For example, if either of the weights comprises a polymer material, then the weights may be glued and/or secured by an adhesive. If, for example, either of the weights is made of metal, then the weights may be similarly glued or secured by an adhesive, and additionally may be secured by any other known method for securing a metal within a cavity, such as welding, swaging, and the like. 
     Although a particular order of actions is illustrated in  FIGS. 6 and 7 , these actions may be performed in other temporal sequences. For example, the actions depicted in  FIGS. 6 and 7  may be performed sequentially, concurrently, or simultaneously. Also, the blocks  640  and  650  can be performed before the blocks  620  and  630 , and the blocks  620  and  640  may be performed before the blocks  630  and  650 . 
     The providing steps in the described methods of  FIGS. 6 and 7  may include designing and/or manufacturing a golf club head. As an example, body  100  in  FIG. 5  may be manufactured using a metal casting process. Furthermore, the described methods may be used to manufacture the other aspects of body  100  described with reference to  FIGS. 1-5 . 
     Continuing with the figures,  FIG. 8  presents a rear view of club head  800  of club head set  80  according to an embodiment of the golf clubs and methods of manufacture described herein.  FIG. 9  presents a toe side view of club head  800 .  FIG. 10  illustrates a rear view of body  801  of club head  800 , where club head  800  is in a disassembled state. Club head  800  is similar to club head  100  ( FIGS. 1-5 ), and comprises loft angle  955  ( FIG. 9 ) between front face  950  ( FIG. 9 ) and shaft bore axis  806 . In the present example of  FIG. 9 , shaft bore axis  806  is defined by a bore of hosel  805 , but there can be other hosel-less examples where shaft bore axis  806  could be defined by a shaft bore at a heel of a club head body. In the present example of  FIG. 8 , club head  800  also comprises back portion  802  comprising back face  860  opposite front face  950  ( FIG. 9 ) and extended between toe region  810  and heel region  820  of back portion  802 . In some embodiments, back portion  802  can also be referred to as a back side of club head  800 . Club head  800  also comprises inserts  885  and  895  in the present embodiment. Insert  885  can be similar to weight  185  ( FIGS. 1, 3 ), and can be inserted at back portion  802  into a cavity  1080  ( FIG. 10 ) similar to cavity  180  of club head  100  ( FIGS. 1, 3, 5 ). Lower toe insert  895  can be similar to weight  195  of club head  100  ( FIGS. 1, 4 ). Club head  800  comprises part of club head set  80  of two or more golf clubs, as will be further discussed below. 
     Club head  800  also comprises insert  862  located at insert base  863  at a center of back face  860  in the present embodiment. As shown in  FIG. 8 , insert  862  comprises a logo or other identifying characteristic related to club head  800 . There can be embodiments where insert  862  can comprise materials such as those described for weight  185  and/or weight  195  in  FIGS. 1, 3, and 4 , such as to have an effect on sound, vibration, frequency, and/or mass distribution of club head  800 . 
     Club head  800  differs from club head  100  ( FIGS. 1-5 ) by comprising support bars  861  coupled to back face  860  astride of, and equidistant from, center region  864 . Support bars  861  comprise support bars  8611  at heel region  820 , and support bar  8612  at toe region  810 , both protruding from back face  860 . There can be other examples, however, with a different number and/or different arrangement of support bars. For example, additional support bars may be positioned between support bar  8611  and the heel end of heel region  820 . Similarly, additional support bars may be positioned between support bar  8612  and the toe end of toe region  810 . In some examples, insert base  863  may be considered as also comprising one or more support bars. For example, base ends  8613  and  8614  of insert base  863  can also be considered in some examples as support bars protruding from back face  860 . In addition, there can be examples where insert base  863  is protruding from back face  860 , such that insert base  863  may itself be considered a support bar. 
     In the present embodiment, support bars  8611  and  8612  comprise substantially the same support bar width. In the same or other embodiments, the support bar width can be of approximately 0.03 inches (0.75 millimeters) to approximately 0.5 inches (12.7) millimeters). Although the support bar width is constant for both support bars  8611  and  8612  in the example of  FIG. 8 , there can be other examples where the support bar width tapers or otherwise varies along a length of a support bar similar to support bar  8611  and/or  8612 . In addition, although the support bar thickness also is constant for support bars  861  in the present example, there also can be examples where the support bar thickness can taper or otherwise vary, as measured from back face  860 , along a length of a support bar similar to support bar  8611  and/or  8612 . 
     Support bars  861  are integral with back face  860  in the present embodiment by comprising part of the same piece of material. For example, support bars  861  can be cast, forged, or machined along with back face  860 . There can be other embodiments where support bars may not be integral with their respective back faces, but are securely attached thereto. In such examples, the support bars can be welded, brazed, epoxied, or otherwise adhered to the back faces. 
     In the present embodiment, support bar  8611  comprises angle  8615  facing center region  864  and measured from horizontal axis  807 . Similarly, support bar  8612  also comprises angle  8616  facing center region  864  and measured from horizontal axis  807 . Horizontal axis  807  is an axis bisecting club  800  into an upper half and a lower half. There can be embodiments where angles  8615  and/or  8616  comprise acute angles of approximately 30 degrees to approximately 90 degrees from horizontal axis  807 . In the same or other embodiments, support bars  8611  and  8612  are angled for convergence towards center region  864 . There can also be embodiments where angles  8615  and/or  8616  can be obtuse and/or of approximately 90 degrees to approximately 150 degrees from horizontal axis  807 . Angles  8615  and  8616  both comprise approximately 68 degrees in the example of  FIG. 8 , but there can be other embodiments where angles  8615  and  8616  are not equal to each other, and/or where at least one of angles  8615  and/or  8616  are not acute relative to center region  864 . Angles  8615  and/or  8616  may remain constant across the different club heads of club head set  80 , or they may vary within the same club head set from club head to club head. 
       FIG. 10  illustrates a rear view of body  801  of club head  800  in a disassembled state. Skipping ahead in the figures,  FIG. 18  illustrates a cross-sectional view of club head  800  along line  18 - 18  from  FIG. 8 . Note that, for simplicity, details about lower toe insert  895  have been left out of  FIG. 18 , but insert  885  is shown as inserted into cavity  1080 . As seen in  FIGS. 8, 10, and 18 , back portion  802  of club head  800  comprises back end  870  extended between heel region  820  and toe region  810 , where back end  870  can be similar to second back  170  of club head  100  ( FIGS. 1, 3-5 ). In some examples, back end  870  can be referred to as a back wall. Cavity  1080  is also located at back portion  802 , between back face  860  and back end  870 , and comprises cavity heel zone  1082 , cavity toe zone  1083 , cavity center zone  1181 , cavity inner section  1084  located towards front face  950 , and cavity outer section  1885  located towards back end  870 . In the present example, cavity inner section  1084  is located opposite back face  860 , and cavity outer section  1885  is located opposite back end  870 . In the present embodiment, as seen in  FIG. 18 , cavity  1080  is wider at cavity center zone  1181  than at either of cavity heel zone  1082  or cavity toe zone  1083 . For example, cavity inner section  1084  is thinner, relative to front face  950 , at cavity center zone  1181  than at either of cavity heel zone  1082  or cavity toe zone  1083 . In some examples, cavity inner section  1084  can be referred to as a cavity inner wall, and/or cavity outer section  1885  can be referred to as a cavity outer wall. 
     In the present example, a distance between front face  950  and an exposed surface of cavity inner section  1084  is greater at cavity heel zone  1082  and at cavity toe zone  1083  than at cavity center zone  1181 . There can also be embodiments where a distance between back end  870  and an exposed surface of cavity outer section  1885  can be greater at cavity heel zone  1082  and at cavity toe zone  1083  than at cavity center zone  1181 . 
     Insert  885  comprises insert heel zone  1886 , insert toe zone  1887 , and insert center zone  1888  in the present embodiment, and is shaped complementarily to cavity  1080  such that insert center zone  1888  is thicker than either of insert heel zone  1886  or insert toe zone  1887 . In the example of  FIG. 18 , insert heel and toe zones  1886  and  1887  are obtusely angled relative to each other along insert inner wall  1889  and about insert center zone  1888 . Similarly, cavity inner section  1084  is obtusely angled complementarily to insert inner wall  1889 . In the present example, cavity  1080  is configured such that insert  885  is insertable in a top-to-sole direction with respect to club head  800 . There can also be examples where insert  885  can be interchangeable with other inserts of similar shape. 
     In some examples, a material of body  801  of club head  800  can comprise a specific gravity of at least approximately 5.0 g/cm 3 , and/or a material of insert  885  can comprise a specific gravity of at least approximately 1.2 g/cm 3 . In the same or other examples, a mass of insert  885  can be of approximately 10 grams. 
     The dimension relationships described above for and between cavity  1080  and insert  885  can be beneficial, for example, to permit adjustments in the distribution of mass for club head  800 . In the present embodiment, where a material of insert  885  is less dense than a material of body  801  of club head  800 , the greater thickness of cavity inner section  1084  at cavity heel zone  1082  and at cavity toe zone  1083 , relative to cavity center zone  1181 , and the greater thickness of insert center zone  1888  relative to insert heel zone  1886  and insert toe zone  1887 , can permit a redistribution of mass away from a center of club head  800  and towards heel and toe regions  820  and  810 . As an example, a distribution of mass of cavity inner section  1084  is shifted towards heel region  820  and towards toe region  810  and away from cavity center zone  1181 . Also, a distribution of mass of insert  885  is concentrated at insert center zone  1888  and diminishes towards insert heel zone  1886  and towards insert toe zone  1887 . 
     Such distributions of mass can augment the moment of inertia about a center region of club head  800 , and improve gameplay by reducing club head twisting during off-center impacts. For example, due to the shapes and configurations described above, a portion of the moment of inertia contributed by cavity inner section  1084  at cavity heel zone  1082  and at cavity toe zone  1083  is greater than a portion of the moment of inertia contributed by insert  885  at insert heel zone  1886  and at insert toe zone  1887 . Other shape and/or density relationships between insert  885  and cavity  1080  may be used to achieve different desired distributions of mass or moments of inertia in other embodiments. 
     As shown in  FIGS. 8 and 18 , insert  885  is partially housed in cavity  1080 , such that a grip portion of insert  885  protrudes outside cavity  1080  to allow or facilitate, for example, insertion or removal of insert  885  to or from cavity  1080 . In other embodiments, however, insert  885  need not protrude from cavity  1080 . Support bars  861  also extend from back face  860  to cavity inner section  1084  in the present embodiment, and cavity inner section  1084  is at least as thick as support bars  861 , relative to back face  860 , so as to prevent support bars  861  from interfering with the insertion or removal of insert  885  into or out of cavity  1080 . 
     Backtracking through the figures,  FIGS. 10-15  illustrate several views of exemplary club heads of club head set  80 .  FIG. 10  illustrates a rear view of body  801  of club head  800 , where club head  800  is in a disassembled state.  FIG. 11  illustrates a rear view of body  1101  of club head  1100  of club head set  80 , where club head  1100  is in a disassembled state.  FIG. 12  illustrates a rear view of body  1201  of club head  1200  of club head set  80 , where club head  1200  is in a disassembled state.  FIG. 13  illustrates a cross-sectional view of club head  800  along a line  13 - 13  of  FIG. 10 .  FIG. 14  illustrates a cross-sectional view of club head  1100  along a line  14 - 14  of  FIG. 11 .  FIG. 15  illustrates a cross-sectional view of club head  1200  along a line  15 - 15  of  FIG. 12 . Club heads  800 ,  1100 , and  1200  can be similar to each other, as detailed below. 
     In the present example, club heads  800 ,  1100 , and  1200  form part of club head set  80  of related golf clubs, where club head set  80  can comprise two or more club heads. Only club heads  800 ,  1100 , and  1200  of club head set  80  are shown in  FIGS. 10-12  for simplicity, but club head set  80  can comprise more than three club heads. There also can be other embodiments where club head set  80  can comprise only two club heads. Each club head of club head set  80  comprises one or more support bars protruded from their respective back faces. For example, as seen in  FIGS. 8 and 10 , club head  800  comprises support bars  861 , including support bars  8611  and  8612  protruded from back face  860 , as detailed above. As seen in  FIG. 11 , club head  1100  comprises support bars  1161 , namely, support bars  11611  and  11612 , protruded from back face  1160 . In addition, as seen in  FIG. 12 , club head  1200  comprises support bars  1261 , namely, support bars  12611  and  12612 , protruded from back face  1260 . 
     In the present example, the loft angles of the club heads of club head set  80  are incrementally varied across the two or more club heads. For instance, in the present example of club head set  80 , club head  800  comprises a 2-iron club head with loft angle  955  ( FIG. 9 ) of approximately 18.5 degrees between front face  950  and shaft bore axis  806 , ( FIG. 13 ); club head  1100  comprises a 6-iron club head with loft angle  1455  of approximately 30.5 degrees between front face  1450  and shaft bore axis  1406  ( FIG. 14 ); and club head  1200  comprises a wedge-iron club head with loft angle  1555  of approximately 47 degrees between front face  1550  and shaft bore axis  1506  ( FIG. 15 ). As a result, the loft angle  1555  of club head  1200  is greater than loft angle  1455  of club head  1100 , which, in turn, is greater than loft angle  955  of club head  800 . 
     Also in the present example, a characteristic of the one or more support bars is incrementally varied across the two or more club heads according to the loft angle. For instance, loft angle  1555  is greater than loft angle  1455  as discussed above, and accordingly, an attribute of support bars  1261  of golf club  1200  ( FIG. 12 ) is greater than an attribute of support bars  1161  of golf club  1100  ( FIG. 11 ). In the present example, the attribute of the support bars that undergoes variation is the support bar width, such that support bars  1261  ( FIG. 12 ) are wider than support bars  1161  ( FIG. 11 ), and support bars  1161  ( FIG. 11 ) are wider than support bars  861  ( FIG. 10 ). 
     The variation of support bar width relative to loft angle is summarized in  FIG. 16  for the exemplary club head set  80 . In the present example, club head set  80  comprises club head  800  as a 2-iron head, club head  1630  as a 3-iron head, club head  1640  as a 4-iron head, club head  1650  as a 5-iron head, club head  1100  as a 6-iron head, club head  1670  as a 7-iron head, club head  1680  as an 8-iron head, club head  1690  as a 9-iron head, and club head  1200  as a wedge-iron head. As can be appreciated from  FIG. 16 , the support bar width attribute is varied incrementally as the loft angle increases from one club head to the next in club head set  80 . As a result, the support bar width for a club with a higher loft angle is greater than or equal to the support bar width for a club with a lower loft angle. There can be examples, however, where the characteristic and/or attribute of the one or more support bars can be incrementally varied for each increment in loft angle, such that the support bar width for a club with higher loft angle is greater than the support bar width for any club with a lower loft angle. 
     Skipping ahead in the figures, as seen in  FIG. 22 , relationships between support bar width and loft angle/club head number may lie within one or more ranges. For example, club head set  2281  comprises club heads with thicker support bar widths that vary from club head to club head as indicated in  FIG. 22 . Similarly, in another example, club head set  2282  comprises club heads with thinner support bar widths that vary from club head to club head as also indicated in  FIG. 22 . Other examples or rates of variation are also possible for other club head sets. 
     In the same or other examples, support bar widths may vary within certain ranges, depending on the loft angle and/or the club head number, for club heads of one or more club head sets. For instance:
         For a 2-iron head, the loft angle can comprise approximately 18 degrees to approximately 20 degrees, and the support bar width can comprise approximately 0.03 inches (0.75 millimeters) to approximately 0.2 inches (5.1 millimeters);   For a 3-iron head, the loft angle can comprise approximately 20 degrees to approximately 23 degrees, and the support bar width can comprise approximately 0.04 inches (1.0 millimeters) to approximately 0.21 inches (5.3 millimeters);   For a 4-iron head, the loft angle can comprise approximately 21 degrees to approximately 25 degrees, and the support bar width can comprise approximately 0.05 inches (1.3 millimeters) to approximately 0.23 inches (5.8 millimeters);   For a 5-iron head, the loft angle can comprise approximately 23 degrees to approximately 28 degrees, and the support bar width can comprise approximately 0.06 inches (1.5 millimeters) to approximately 0.26 inches (6.6 millimeters);   For a 6-iron head, the loft angle can comprise approximately 26 degrees to approximately 32 degrees, and the support bar width can comprise approximately 0.07 inches (1.8 millimeters) to approximately 0.30 inches (7.6 millimeters);   For a 7-iron head, the loft angle can comprise approximately 29 degrees to approximately 36 degrees, and the support bar width can comprise approximately 0.08 inches (2.0 millimeters) to approximately 0.34 inches (8.7 millimeters);   For a 8-iron head, the loft angle can comprise approximately 34 degrees to approximately 42 degrees, and the support bar width can comprise approximately 0.09 inches (2.3 millimeters) to approximately 0.39 inches (9.8 millimeters);   For a 9-iron head, the loft angle can comprise approximately 38 degrees to approximately 45 degrees, and the support bar width can comprise approximately 0.10 inches (2.5 millimeters) to approximately 0.44 inches (11.2 millimeters); and/or   For a wedge-iron head, the loft angle can comprise approximately 42 degrees to approximately 64 degrees, and the support bar width can comprise approximately 0.11 inches (2.8 millimeters) to approximately 0.50 inches (12.7 millimeters).       

     In the same or other embodiments, one or more other characteristics or attributes of the support bars can vary, besides, instead of, or in addition to the support bar width, in a fashion similar to that described above for the support bar width. For example, in one embodiment, the other characteristic or attribute can comprise a support bar thickness, measured from the back face, that may be incrementally varied according to the loft angle. In such an example, a thickness of support bars  1261  of club head  1200  in  FIG. 12  could be thicker than a thickness of support bars  1161  of club head  1100  in  FIG. 11 , and/or a thickness of support bars  1161  of club head  1100  in  FIG. 11  could be thicker than a thickness of support bars  861  of club head  800  in  FIG. 10 . 
     In the same or another embodiment, the other characteristic or attribute can comprise a total number of support bars that may be incrementally varied according to the loft angle. Such an embodiment is illustrated in  FIG. 17  for club head set  171 , comprising club head  800 , club head  1702  similar to club head  1100 , and club head  1703  similar to club head  1200 . In the example of  FIG. 17 , the loft angle for club head  1703  is greater than the loft angle for club head  1702 , and the loft angle for club head  1702  is greater than the loft angle for club head  1701 , such that the total number of support bars for club head  1703  is greater than the total number of support bars for club head  1702 , and the total number of support bars for club head  1702  is greater than the total number of support bars for club head  1701 . In one example, the support bar width, thickness, and angle remains the same for each of the support bars in a single club head. In other examples, more than one characteristic or attribute is varied per club head, and/or support bars within a single club head can have different widths, thicknesses, and/or angles. 
     The incorporation of support bars at the back faces of the club heads of club head sets as described above can be beneficial for several reasons. For example, the placement of support bars proximate to a center region at back face of a club head can increase support for the front face and/or face plate to better withstand stresses associated with impacts to golf balls. Such additional support can be useful in situations where the face plate thickness has been minimized for weight savings and/or weight redistribution considerations. 
     In the case of short irons, such as wedge heads like club head  1200  in  FIGS. 12 and 15 , the placement of wider and/or thicker support bars such as support bars  1261  at back face  1260  just opposite to front face  1550  can have the effect of shifting the center of gravity of club head  1200  towards the front thereof. This shift can reduce a gear effect between front face  1550  and a golf ball, thereby limiting spin imparted onto the golf ball upon impact with front face  1550  for better trajectory control. In addition, better distance control and repeatability may be gained as a result of added face stability and reduced face deflection during impact due to the wider and/or thicker support bars. In some examples, similar results can also be achieved by having an increased number of support bars, such as in the case of support bars  1761  of club head  1703  in  FIG. 17 . 
     In the case of long irons, such as 2-irons like club head  800  in  FIGS. 8, 10, and 13 , the moment of inertia of the club head can be increased for better control by decreasing the relevant characteristic or attribute of the support bars, whether it be support bar width, support bar thickness, and/or total number of support bars, such that more of the mass of club head  800  can be distributed towards the edges of front face  950  of club head  800  for increased moment of inertia. In addition, longer and/or more penetrating flight paths may be achieved due to the decreased relevant support bar characteristic by permitting greater flexure of the front face and/or face plate of the club head. 
     Furthermore, in cases such as depicted for club head set  80 , because the support bars are visible at the back face of the club heads, an increase in user confidence may be achieved for users that can appreciate the enhanced support, strength, and control features that the arrangement of support bars provides. 
     Backtracking to  FIG. 8 , club head  800  also is shown as comprising lower toe insert  895  in addition to insert  885  and related cavity  1080  ( FIG. 10 ). There can be, however, other embodiments comprising insert  885  and cavity  1080  without lower toe insert  895 , and/or other embodiments comprising lower toe insert  895  without insert  885  and cavity  1080 . Similar variations in features can be extended for other clubs of respective club head sets. For example, all or part of the club heads of club head set  80  may comprise lower toe inserts similar to lower toe insert  895 , in addition to inserts and related cavities similar to insert  885  and related cavity  1080 . There can also be embodiments where all or a portion of the club heads of a club head set may comprise inserts and related cavities similar to insert  885  and related cavity  1080 , but may lack lower to inserts similar to lower toe insert  895 . There can also be embodiments where all or a portion of the club heads of a club head set may comprise lower toe inserts similar to lower toe insert  895 , but may lack inserts and related cavities similar to insert  885  and related cavity  1080 . 
     Continuing with  FIG. 8 , lower toe insert  895  can be similar to weight  195  of club head  100  ( FIGS. 1, 4 ) and, in the present example, also comprises a weight. Lower toe insert  895  is located at lower toe section  811  of back portion  802 , and although club head  800  comprises perimeter weight  875 , lower toe insert  895  is located only at lower toe section  811 . In the present example, lower toe insert  895  comprises a tungsten material and a specific gravity of approximately 10 g/cm 3  In the present example, the other club heads of club head set  80  also comprise corresponding lower toe inserts similar to lower toe insert  895 . 
     In some examples, lower toe insert  895  and/or other similar inserts can be located at lower toe portion  811  to effect a redistribution of mass of club head  800 . For example, lower toe insert  895  can be configured to shift the mass distribution of club head  800  away from center region  861  and towards toe region  810  and/or lower toe section  811  to thereby increase the moment of inertia of club head  800 . In the same or other examples, lower toe insert  895  can be configured to counterbalance the mass of hosel  805  at the heel or upper heel portion of club head  800 . By having hosel  805  and lower toe insert  895  substantially opposite each other, the distribution of mass of club head  800  can be shifted towards the ends of club head  800  to thereby increase its moment of inertia and forgiveness factor. In the same or other examples, the dimensions, location, and/or mass of lower toe insert  895  can be configured such as to adjust or align the center of gravity of club head  800  at a desired location relative to heel region  820  and/or toe region  810 . 
     As previously described, the loft angles of the club heads of club head set  80  are incrementally varied across the two or more club heads in the present example. In addition, characteristics or dimensions of the corresponding lower toe inserts are also varied across the two or more club heads of club head set  80  in relation with the variation in loft angle. For instance, where each lower toe insert comprises two characteristics, the two characteristics can be inversely varied relative to each other for each lower toe insert across the club heads of club head set  80  as the loft angle is varied. As an example, a varied characteristic of the lower toe inserts may be incrementally varied, while an inverse characteristic of the lower toe inserts is decrementally varied as the loft angle changes. 
     The variation in characteristics relative to loft angle can be further appreciated as presented in  FIGS. 10-15 , for the example of club head set  80 , via club heads  800 ,  1100 , and  1200 . As seen in  FIGS. 13-15 , loft angle  1555  of club head  1200  is greater than loft angle  1455  of club head  1100 , which in turn is greater than loft angle  955  of club head  800 . Furthermore, for the present embodiment, as loft angles increase from club head to club head, lower toe thicknesses, as measured along respective depth axes of the club heads, tend to increase from club head to club head. In the same and other embodiments, the lower toe thickness of a club head can be related and/or defined by a sole of the club head. As an example, lower toe thickness  15954  ( FIG. 15 ) of club head  1200  is greater than lower toe thickness  14954  ( FIG. 14 ) of club head  1100 , which in turn is greater than lower toe thickness  13954  ( FIG. 13 ) of club head  800 . Similarly, lower toe thickness  13954  of club head  800  is defined by, and comprises a portion of, a thickness of sole  13001  ( FIG. 13 ), while lower toe thickness  15954  of club head  1200  is defined by, and comprises a portion of, a thickness of sole  15001  ( FIG. 15 ), such that the thickness of sole  15001  is greater than the thickness of sole  13001 . 
     In the embodiment of club head set  80 , the varied characteristic can be a depth of the lower toe insert, while the inverse characteristic can be an area of the lower toe insert. As an example, for club head  800 , insert depth  13952  ( FIG. 13 ) of lower toe insert  895  is measured along depth axis  13953 , where depth axis  13953  traverses minimum distance point  13955  between lower toe insert  865  and front face  950 , where insert area  8951  ( FIGS. 8, 10 ) represents a cross-sectional area of lower toe insert  895  substantially perpendicular to depth axis  13953  and/or where depth axis  13953  is substantially parallel to sole  13001  ( FIG. 13 ) and/or is substantially perpendicular to shaft bore axis  806 . Similarly, for club head  1100 , insert depth  14952  ( FIG. 14 ) is measured along depth axis  14953 , where depth axis  14953  traverses minimum distance point  14955  between lower toe insert  1195  and front face  1450 , where insert area  11951  ( FIG. 11 ) represents a cross-sectional area of lower toe insert  1195  substantially perpendicular to depth axis  14953 , and/or where depth axis  14953  is substantially parallel to sole  14001  ( FIG. 14 ) and/or is substantially perpendicular to shaft bore axis  1406 . As another example, for club head  1200 , insert depth  15952  ( FIG. 15 ) is measured along depth axis  15953 , where depth axis  15953  traverses minimum distance point  15955  between lower toe insert  1295  and front face  1550 , and where insert area  12951  ( FIG. 12 ) represents a cross-sectional area of lower toe insert  1295  substantially perpendicular to depth axis  15953 , and/or where depth axis  15953  is substantially parallel to sole  15001  ( FIG. 15 ) and/or is substantially perpendicular to shaft bore axis  1506 . In such examples, where the varied characteristic of lower toe insert depth ( 13952 ,  14952 ,  15952 ) increases from club head  800  to club head  1200 , the inverse characteristic of lower toe area ( 8991 ,  11951 ,  12951 ) decreases from club head  800  to club head  1200 . In a different embodiment, the lower toe insert depth ( 13952 ,  14952 ,  15952 ) increases as the loft angle ( 955 ,  1455 ,  1555 ) increases. 
     In the same or other embodiments, one of the characteristics or dimensions that vary can be a distance between a center of gravity of the lower toe insert and the front face of respective club head. For instance, a distance between the center of gravity of a lower toe insert and the front face of a corresponding lower-lofted club head can be greater than a distance between the center of gravity of a lower toe insert and the front face of a corresponding higher-lofted club head. As an example, distance  13957  between center of gravity  13956  of lower toe insert  895  and front face  950  of club head  800  ( FIG. 13 ) is greater than distance  14957  between center of gravity  14956  of lower toe insert  1195  and front face  1450  of club head  1100  ( FIG. 14 ), which in turn is greater than distance  15957  between center of gravity  15956  of lower toe insert  1295  and front face  1550  of club head  1200  ( FIG. 15 ). In such examples, where the varied characteristic of lower toe insert depth ( 13952 ,  14952 ,  15952 ) increases from club head  800  to club head  1200 , the inverse characteristic of center of gravity distance ( 13957 ,  14957 ,  15957 ) decreases from club head  800  to club head  1200 . In a different embodiment, the center of gravity distance ( 13957 ,  14957 ,  15957 ) decreases as the loft angle ( 955 ,  1455 ,  1555 ) increases. 
     The club head variations described above based on loft angle can permit the insert depths of the lower toe inserts to vary. For example, insert depth  15952  ( FIG. 15 ) of insert  1295  is greater than insert depth  14952  ( FIG. 14 ) of insert  1195 , which in turn is greater than insert depth  13952  ( FIG. 13 ) of lower toe insert  895 . Furthermore, distances between the lower toe inserts and the respective club head front faces can vary accordingly. In the present example of club head  80 , insert-to-face distance  1360  ( FIG. 13 ) of club head  800  is of approximately 0.281 inches (7.14 millimeters), which is greater than insert-to-face distance  1460  ( FIG. 14 ) of club head  1100  at approximately 0.233 inches (5.92 millimeters), which, in turn, is greater than insert-to-face distance  1560  ( FIG. 15 ) of club head  1200  at approximately 0.195 inches (4.95 millimeters). 
     Such variation in the insert depths of the lower toe inserts, in the distances between the lower toe inserts and their respective club head front faces, and/or in the distances between the center of gravity of the lower toe inserts and their respective club head front faces, can vary mass distribution for the club heads, thereby permitting the adjustment of certain qualities of the club heads. 
     For example, by having shallower insert depths and/or larger insert-to-face distances for lower-lofted club heads, the center of gravity of such club heads can be moved away from the respective club head front faces, thereby increasing club head dynamic loft and imparted spin such as to allow higher launch angles and/or flight trajectories for impacted balls. Conversely, by having deeper insert depths and/or shallower insert-to-face distances for higher-lofted club heads, the center of gravity of such club heads can be moved closer to the respective club head front faces, thereby allowing for more penetrating flight paths for impacted balls. 
     The variation in insert depth described above could lead to a variation in mass of the different lower toe inserts of the club heads. To counteract such mass variation, and the effects it could have on other qualities of the club heads, like the counterbalancing of respective hosels with respective lower toe inserts, other characteristics or dimensions of the lower toe inserts can be varied inversely with respect to the variation in insert depth. For example, as the insert depths of the lower toe inserts increase, an area of the lower toe inserts can be decreased, such that all lower toe inserts comprise substantially similar masses. In some embodiments, a mass of each of the lower toe inserts of club head set  80  comprises approximately 10.25 grams. In the same or other examples, such mass may be of approximately 5 grams to approximately 50 grams. In the example of club head set  80 , as insert depths vary by increasing from insert depth  13952  ( FIG. 13 ) to insert depth  14952  ( FIG. 14 ), and from insert depth  14952  to insert depth  15952  ( FIG. 15 ), corresponding areas for the inserts inversely vary by decreasing from insert area  8951  ( FIG. 10 ) to insert area  11951  ( FIG. 11 ), and from insert area  11951  ( FIG. 11 ) to insert area  12951  ( FIG. 12 ). 
       FIG. 19  illustrates an exemplary relationship between loft angle and the distances between lower toe inserts to front faces for the embodiment of club head set  80 . Skipping ahead in the figures, as seen in  FIG. 23 , relationships between front-face-to-lower-toe-weight distances and loft angle/club head number may lie within one or more ranges. For example, club head set  2381  comprises club heads with longer front-face-to-lower-toe-weight distances that vary from club head to club head as indicated in  FIG. 23 . Similarly, in another example, club head set  2382  comprises club heads with shorter front-face-to-lower-toe-weight distances that vary from club head to club head as also indicated in  FIG. 23 . The club heads of club head set  2381  can have soles that are generally wider, from front to back of the club head, than the soles of the club heads of club head set  2382 . Other examples or rates of variation are also possible for other club head sets. 
     In the same or other examples, front-face-to-lower-toe-weight distances may vary within certain ranges, depending on the loft angle and/or the club head number, for club heads of one or more club head sets. For instance: 
     A 2-iron front-face-to-lower-toe-weight distance can comprise approximately 0.050 inches (1.27 millimeters) to approximately 1.2 inches (28.08 millimeters); 
     A 3-iron front-face-to-lower-toe-weight distance can comprise approximately 0.048 inches (1.22 millimeters) to approximately 1.2 inches (28.08 millimeters); 
     A 4-iron front-face-to-lower-toe-weight distance can comprise approximately 0.046 inches (1.17 millimeters) to approximately 1.19 inches (27.85 millimeters); 
     A 5-iron front-face-to-lower-toe-weight distance can comprise approximately 0.044 inches (1.12 millimeters) to approximately 1.17 inches (27.38 millimeters); 
     A 6-iron front-face-to-lower-toe-weight distance can comprise approximately 0.042 inches (1.07 millimeters) to approximately 1.16 inches (27.14 millimeters); 
     A 7-iron front-face-to-lower-toe-weight distance can comprise approximately 0.040 inches (1.02 millimeters) to approximately 1.15 inches (26.91 millimeters); 
     A 8-iron front-face-to-lower-toe-weight distance can comprise approximately 0.038 inches (0.97 millimeters) to approximately 1.13 inches (26.44 millimeters); 
     A 9-iron front-face-to-lower-toe-weight distance can comprise approximately 0.036 inches (0.91 millimeters) to approximately 1.125 inches (26.33 millimeters); and/or 
     A wedge-iron front-face-to-lower-toe-weight distance can comprise approximately 0.034 inches (0.86 millimeters) to approximately 1.10 inches (25.74 millimeters). 
     Backtracking to  FIGS. 13-15 , to simplify matters, relationships between higher-lofted club heads and lower-lofted club heads, with respect to their lower-toe inserts, will be described below by referencing club heads  800  and  1200  of club head set  80 . Relationships between other club heads may be extrapolated or interpolated based on the description below of club heads  800  and  1200 . 
     In the present example of club head set  80 , lower toe insert  895  of club head  800 , and lower toe insert  1295  of club head  1200 , comprise weights with substantially similar masses. In addition, dimensions of lower toe inserts  895  and  1295  correspond to each other, such that insert depth  13952  ( FIG. 13 ) of lower toe insert  895  corresponds to insert depth  15952  ( FIG. 15 ) of lower toe insert  1295 , and insert area  8951  ( FIG. 10 ) of lower toe insert  895  corresponds to insert area  12951  ( FIG. 12 ) of lower toe insert  1295 . Insert areas  8951  and  12951  can represent cross-sectional areas and/or back-end areas of their respective lower toe inserts in the present or other embodiments. In the present example, because insert depth  15952  of lower toe insert  1295  is greater than insert depth  13952  of lower toe insert  895 , insert area  8951  of lower toe insert  895  is greater than insert area  12951  of lower toe insert  1295 . As a result, the insert area and insert depth dimensions are inversely varied relative to each other. 
     Furthermore, as seen in  FIGS. 13 and 15 , insert-to-face distance  1560  between lower toe insert  1595  and front face  1550  is greater than insert-to-face distance  1360  between lower toe insert  895  and front face  950 . In the present example, insert-to-face distance  1560  comprises a shortest distance between front face  1550  and lower toe insert  1295 , while insert-to-face distance  1360  comprises a shortest distance between front face  950  and lower toe insert  895 . Such relationships described above between lower toe inserts ( 895 ,  1295 ) and front faces ( 950 ,  1550 ) of respective club heads  800  and  1200  define respective distributions of mass such that a center of gravity of club head  1200  can be closer to front face  1550  than a center of gravity of club head  800  is to front face  950 . 
     In the present examples, both lower toe inserts  895  and  1295  are visible at their respective lower toe sections of club heads  800  and  1200 . In some examples, such visibility of the lower toe inserts may inspire user confidence for users that can appreciate the enhanced performance and control features that the arrangement of the respective lower toe inserts provides. There can be other embodiments, however, where lower toe inserts may not be visible. For example, the interface between the lower toe insert  895  and lower toe section  811  may blend or otherwise become indiscernible after machining or polishing steps. 
     In the example of club head set  80 , club head  800  comprises perimeter weight  875  at a periphery of back portion  802 , and club head  1200  comprises perimeter weight  1275  at a periphery of pack portion  1202 . Perimeter weight  875  comprises a cavity at lower toe section  811 , where lower toe insert  895  is located. Similarly, perimeter weight  1275  comprises a cavity at lower toe section  1211 , where lower toe insert  1295  is located. As a result, the lower toe inserts can be integrated with their respective perimeter weights while still being located only at their respective lower toe sections. In addition, in the present example, lower toe insert  1295  is incompatible with the cavity of lower toe section  811  in club head  800 , while lower toe insert  895  is incompatible with the cavity of lower toe section  1211  in club head  1200 . 
     Forging ahead,  FIG. 20  illustrates a flowchart of method  2000  for providing a club head set. In some examples, the club head set of method  2000  can be similar to club head set  80  of  FIGS. 8-16 and 18-19 , and/or to club head set  171  of  FIG. 17 . 
     Block  2010  of method  2000  comprises providing a first club head of a club head set, the first club head comprising one or more first support bars coupled to the first back face, the one or more first support bars comprising a first support bar characteristic. In some examples, the first club head can be similar to club head  1200  ( FIGS. 12, 15, 16, 19 ), and the one or more first support bars can be similar to support bars  1261  ( FIG. 12 ) coupled to back face  1260 , or to support bars  1761  ( FIG. 17 ) coupled to back face  1760 . In the same or other examples, the first support bar characteristic can comprise a support bar width, a support bar thickness, and/or a total number of support bars. 
     Block  2020  of method  2000  comprises providing a second club head of the club head set, the second club head comprising one or more second support bars coupled to the second back face, the one or more second support bars comprising a second support bar characteristic. In some examples, the second club head can be similar to club head  800  ( FIGS. 8-10, 13, 16-19 ), and the one or more first support bars can be similar to support bars  861  ( FIGS. 8, 12, 17 ) coupled to back face  860 . In the same or other examples, the second support bar characteristic can comprise a second support bar width, a second support bar thickness, and/or a second total number of support bars. 
     Block  2030  of method  2000  comprises providing a first loft angle of the first club head to be greater than a second loft angle of the second club head. In some examples, the first loft angle can be similar to loft angle  1555  ( FIG. 15 ) of club head  1200 , and the second loft angle can be similar to loft angle  955  ( FIGS. 9, 13 ) of club head  800 . 
     Block  2040  of method  2000  comprises providing the first support bar characteristic of the first club head to be greater than the second support bar characteristic of the second club head. As a result, the support bar characteristic would be greater for the club head having a greater loft angle. As an example, the first support bar characteristic for club head  1200  in  FIG. 12  comprises a support bar width of support bars  1261 , while the second support bar characteristic for club head  800  in  FIG. 10  comprises a support bar width of support bars  861 . As can be seen by comparing  FIGS. 8 and 12 , and by referring to the graph in  FIG. 16 , the support bar width for support bars  1261  ( FIG. 12 ) is greater than the support bar width for support bars  861  ( FIG. 10 ) in the example of golf club set  80 . In the same or another example, where the support bar characteristic comprised a support bar thickness, the support bar thickness for support bars  1261  ( FIG. 12 ) can be thicker than the support bar thickness for support bars  861  ( FIG. 10 ). In the example of  FIG. 17 , the support bar characteristics comprise a total number of support bars and, as can be seen by comparing club head  1703  against club head  800  in  FIG. 17 , the total number of support bars  1761  in club head  1703  comprises support bars  12611 - 12612  and  17613 - 17616 , and is thus greater than the total number of support bars  861  in club head  800 , which comprises support bars  8611 - 8612 . 
     There can be examples where the description above for method  2000  can be extended throughout the two or more club heads of the club head set. For example, method  2000  could comprise providing two or more club heads of the club head set, and providing a support bar characteristic for each of the two or more club heads, the support bar characteristic incrementally varying across the two or more club heads in accordance with loft angle variation across the two or more club heads. In such an example, the two or more club heads comprise the first and second club heads of blocks  2010  and  2020 . In addition, the support bar characteristic for the first club head could comprise the first support bar characteristic described above with respect to blocks  2010  and  2040 , while the support bar characteristic for the second club head could comprise the second support bar characteristic described above with respect to blocks  2020  and  2040 . In the same or other examples, providing the support bar characteristic for each of the two or more club heads can comprises incrementally varying the support bar characteristic across the two or more club heads for each incremental loft angle variation across the two or more club heads. 
     In some examples, method  2000  could comprise providing a hosel for a club head of the club head set, and providing a counterbalance weight located only at a lower toe section at a back portion of the club head to counterbalance the hosel. In some examples, a counterbalance weight can be provided for the first club head of block  2010 , for the second club head of block  2020 , and/or for several or all of the club heads of the golf club set of method  2000 . In some examples, the counterbalance weight can be similar to lower toe insert  895  ( FIGS. 8, 10, 13 ) and or to lower toe insert  1295  ( FIGS. 12, 15 ). 
     There can also be examples of method  2000  where an insert can be provided and located in a cavity at a back portion of a club head. For instance, a first back portion of the first club head can further comprise a back wall extended between the heel and toe regions and a first cavity located between the first back face and the back wall. The first cavity can comprises a cavity heel zone, a cavity toe zone, a cavity center zone, a cavity inner wall located opposite the first back face, and a cavity outer wall located opposite the back wall. In addition, the cavity inner wall of the first cavity can be thicker, relative to the first front face, at the cavity heel and toe zones than at the cavity center zone. In some examples, the first cavity can be similar to cavity  1280  of club head  1200  ( FIG. 12 ), which can also be similar to cavity  1080  of club head  800  ( FIG. 10 ). Also, the first club head can further comprise a first insert comprising an insert heel zone, an insert toe zone and an insert center zone, where the first insert is configured to be at least partially housed in the first cavity, and each of the insert heel and toe zones are thinner than the insert center zone. The first insert can comprise an insert inner wall complementary to the cavity inner wall, such that the insert heel and toe zones are obtusely angled relative to each other along the insert inner wall and about the insert center zone, and/or such that the cavity inner wall is obtusely angled complementarily to the insert inner wall. In some examples, the first inset can be similar to insert  885 , as described above for  FIGS. 8, and 18 . Such arrangements may beneficial, for example, to redistribute mass away from a center of the club head to augment the moment of inertia thereof, as described above with respect to insert  885  and cavity  1080  of club head  800  ( FIGS. 8, 10 ). 
     In some examples, some of the blocks of method  2000  can be subdivided into one or more sub-blocks. For example, block  2010  can be subdivided into several sub-blocks as described above for providing different portions of the first club head, such as the cavity and the insert at the back portion thereof. 
     In the same or other examples, one or more of the different blocks of method  2000  can be combined into a single block or performed simultaneously, and/or the sequence of such blocks can be changed. For example, block  2030  can occur simultaneously with block  2010  for the first club head, and can occur simultaneously with block  2020  for the second club head. In addition, block  2040  can occur simultaneously with block  2030 . In another example, all of the details of the first club head can be performed in a first block, and all of the details of the second club head can be performed in a second block. 
     There can also be examples where method  2000  can comprise further or different blocks. As an example, method  2000  can also comprise individual blocks similar to blocks  2010  and/or  2020  for each of the two or more club heads of the club head set of method  2000 . Other variations can be implemented for method  2000  without departing from the scope of the present disclosure. 
     Moving on,  FIG. 21  illustrates a flowchart of method  2100  for providing a club head set. In some examples, the club head set of method  2100  can be similar to club head set  80  of  FIGS. 1-16 and 19 , and/or to club head set  171  of  FIG. 17 . 
     Block  2110  of method  2100  comprises providing a first club head of a club head set, the first club head comprising a first loft angle and a first rear lower toe section comprising a first cavity. In some examples, the first club head can be similar to club head  1200  ( FIGS. 12, 15, 16, 19 ), such that the first loft angle can be similar to loft angle  1555  ( FIG. 15 ), and the first cavity can be similar to cavity  1596  at lower toe section  1211  of club head  1200  ( FIG. 15 ). 
     Block  2120  of method  2100  comprises providing a first weight at the first cavity. In some examples, the first weight can be similar to lower toe insert  1295  at cavity  1596  of club head  1200  ( FIG. 15 ). 
     Block  2130  of method  2100  comprises providing a second club head of the club head set, the second club head comprising a second loft angle and a second rear lower toe section comprising a second cavity, the first loft angle greater than the second loft angle. There can be examples where the second club head can be similar to club head  800  ( FIGS. 8, 9, 10, 13, 17, 18 ), such that the second loft angle can be similar to loft angle  955  ( FIGS. 9, 13 ), and the second cavity can be similar to cavity  1396  at lower toe section  811  of club head  800  ( FIG. 13 ). In other examples, the second club head can be another club head of the club head set having a loft angle less than the loft angle of the first club head. 
     Block  2140  of method  2100  comprises providing a second weight at the second cavity, such that a first depth of the first weight is greater than a second depth of the second weight, and a second area of the second weight is greater than a first area of the first weight. There can be examples where the second weight can be similar to lower toe insert  895  at cavity  1396  of club head  800  ( FIG. 13 ). In such examples, the first depth and the first area of the first weight can be respectively similar to insert depth  15952  ( FIG. 15 ) and insert area  12951  ( FIG. 12 ), while the second depth and the second area can be respectively similar to insert depth  13952  ( FIG. 13 ) and insert area  8951  ( FIG. 10 ), and as a result, insert depth  15952  of lower toe insert  1295  is greater than insert depth  3952  of lower toe insert  895 , and insert area  8951  of lower toe insert  895  is greater than insert area  12951  of lower toe insert  1295 . 
     There can be implementations where the relationship above between the first and second areas of the first and second weights can be achieved by varying respective lengths and widths of the first and second weights. For example, the a second length of the second weight can be made greater than a first length of the first weight, and/or a second width of the second weight can be made greater than a first width of the first weight. In the example of club head set  80 , where area  8951  ( FIG. 10 ) is defined by length  8952  and width  8953  of lower toe insert  895 , and where area  12951  ( FIG. 12 ) is defined by length  12952  and width  12953 , area  8951  of lower toe insert  895  can be greater than area  12951  of lower toe insert  1295  as a result of length  8952  being greater than length  12952 , and/or as a result of width  8953  being greater than width  12953 . In the present example, length  8952  and width  8953  of lower toe insert  895  are substantially the similar to each other, measuring approximately 0.475 inches (12.06 millimeters), while length  12952  and width  12953  of lower toe insert  1295  are also substantially similar to each other, measuring approximately 0.425 inches (10.8 millimeters). The corresponding length and width of lower insert weight  1195  ( FIG. 11 ) measure approximately 0.450 inches (11.43 millimeters). There can be other embodiments, however, where the length and area of a lower toe insert need not be substantially similar to each other. 
     In some embodiments, block  2140  of method  2100  can further comprise providing a second minimum distance from the second weight to the second front face to be greater than a first minimum distance from the first weight to the first front face. In the same or other embodiments, block  2140  can also comprise providing a center of gravity of the first club head to be closer to the first front face than what a center of gravity of the second club head is to the second front face. For example, the second minimum distance can be similar to insert-to-face distance  1560  between lower toe insert  1295  and front face  1550  of club head  1200  ( FIG. 15 ), while the first minimum distance can be similar to insert-to-face distance  1360  between lower toe insert  895  and front face  950  of club head  800  ( FIG. 13 ). In the same or other embodiments, such arrangement may allow the center of gravity of higher-lofted club heads, like club head  1200 , to be closer to their respective front faces than the center of gravity of lower lofted club heads like club head  800 . 
     There can also be examples of method  2100  where an insert can be provided for location in a cavity at a back portion of a club head of the club head set of method  2100 , similar to as described above for method  2000  and/or with respect to cavities  1080  ( FIG. 10 ) and  1280  ( FIG. 12 ) of club heads  800  and  1200 , respectively, and inserts similar to insert  885  ( FIG. 8, 18 ). For instance, the cavity inner wall of the cavity may be thinner at the cavity center zone than at the cavity heel and toe zones. Similarly, the insert center zone may be thicker than the insert heel and toe zones for said insert. Such arrangements may beneficial, for example, to redistribute mass away from a center of the club head to augment the moment of inertia thereof, as described above with respect to insert  885  and cavity  1080  of club head  800  ( FIGS. 8, 10 ). 
     There also can be embodiments of method  2100  where the description above for can be extended throughout a portion or all of the two or more club heads of the club head set. For example, method  2100  could comprise providing two or more club heads of the club head set, and inversely varying the depth and area of the lower toe inserts as the loft angles of the respective club heads increase across the two or more club heads of the club head set. 
     In some examples, some of the blocks of method  2100  can be subdivided into one or more sub-blocks. For example, block  2110  can be subdivided into several sub-blocks as described above for providing different portions of the first club head, such as the cavity and the insert at the back portion thereof. As another example, block  2140  also can comprise providing a mass of the second weight to be substantially similar to a mass of the first weight. Similar provisions can also be made across method  2100  such that the masses of all lower toe inserts of the club head set are substantially similar to each other. 
     In the same or other examples, one or more of the different blocks of method  2100  can be combined into a single block or performed simultaneously, and/or the sequence of such blocks can be changed. For example, block  2110  can occur simultaneously with block  2120  for the first club head, and/or block  2130  can occur simultaneously with block  2140  for the second club head. 
     There can also be examples where method  2100  can comprise further or different blocks. As an example, method  2100  can also comprise individual blocks similar to blocks  2110  and/or  2120  for each of the two or more club heads of the club head set of method  2100 . Other variations can be implemented for method  2100  without departing from the scope of the present disclosure. 
     Skipping ahead,  FIG. 24  illustrates a flowchart of method  2400  for providing a club head. In some examples, the club head of method  2400  can be similar to club head  800  as depicted for  FIGS. 8-10 and 18 . 
     Block  2410  of method  2400  comprises providing an insert for the golf club head of method  2400 . In some examples, the insert can be similar to insert  185  ( FIGS. 1, 3 ) and/or to insert  885  ( FIGS. 8, 18 ). The insert can comprise heel, toe, and center zones, where the center zone is thicker than the heel and toe zones. 
     Block  2420  of method  2400  comprises providing a body of the golf club head with a cavity for the insert at a back portion of the body. Providing the body can comprise providing a back face and a back end at a back portion of the body, and providing the cavity between the back face and the back end. The cavity can comprise a cavity inner section adjacent to the back face, a cavity outer section opposite the back end, cavity heel and toe zones, and a cavity center zone thicker than the cavity heel and toe zones. In some examples, the body can be similar to body  801  of club head  800  ( FIGS. 8, 18 ), the back face can be similar to back face  860  ( FIGS. 8, 18 ), the back end can be similar to back end  870  ( FIGS. 8, 18 ), and the cavity can be similar to cavity  1080  ( FIGS. 10, 18 ). 
     Block  2430  of method  2400  comprises inserting the insert into the cavity of the body of the golf club head. In some examples, block  2430  can include adhering or otherwise coupling the insert to the cavity. 
     In some examples, some of the blocks of method  2400  can be subdivided into one or more sub-blocks. For example, block  2420  can be subdivided into several sub-blocks for providing different portions of the body of the club head. 
     In the same or other examples, one or more of the different blocks of method  2400  can be combined into a single block or performed simultaneously, and/or the sequence of such blocks can be changed. For example, block  2410  can occur simultaneously with or after block  2420  in some examples. In other examples one of blocks  2410  or  2420  may be optional. There can also be examples where method  2400  can comprise further or different blocks. Other variations can be implemented for method  2400  without departing from the scope of the present disclosure. 
     Continuing with the figures,  FIG. 25  presents a rear view of club head  25000  of club head set  250  according to an embodiment of the golf clubs and methods of manufacture described herein.  FIG. 26  presents a rear view of club head  26000  of club head set  250 , and  FIG. 27  presents a rear view of club head  27000 , also of club head set  250 . Club head set  250  comprises one or more club heads, such as club heads  25000  ( FIG. 25 ),  26000  ( FIG. 26 ), and  27000  ( FIG. 27 ), having respective diagonal stabilizing bars at their back faces. As will be described below, such diagonal stabilizing bars can be used for strengthening the club heads by reducing club head deformation and/or inhibiting vibrations with the club heads upon impact with a golf ball. In addition, in the same or other examples, such diagonal stabilizing bars may be angled, depending on the loft angle of the club heads, to be aligned with a strike path of the club head so as to better reinforce the club heads against deformation and/or absorb vibrations along expected impact points or paths, and/or to provide better desired directionality control for the impacted golf ball. 
     In the example of  FIG. 25 , club head  25000  is shown as a wedge iron head comprising back face  25100  opposite a strike face thereof. There can be other embodiments, however, where other types of club heads may be used, such as irons or iron-like club heads of higher or lower loft. Club head  25000  also comprises toe region  25210 , heel region  25220 , toe end  25230 , heel end  25240 , top rail or top end  25250 , and sole or bottom end  25260 . Vertical axis  25290  extends through top end  25250  and bottom end  25260 , splitting club head  25000  between heel region  25220  and toe region  25210 . 
     In the present example, back face  25100  of club head  25000  comprises cavity  25300  located at toe region  25210 , where cavity  25300  comprises cavity base  25310 , and cavity wall  25320  bounding at least a portion of cavity base  25310 . Cavity base  25310  is sunk in relative to perimeter  25110  of back face  25100  in the present example, such that perimeter  25110  protrudes above cavity base  25310  and defines at least a portion of cavity wall  25320 . There can be other examples, however, where cavity wall  25320  may not completely bound cavity base  25310 , and/or where perimeter  25110  may not protrude above cavity base  25310 . In some embodiments, perimeter  25110  is a perimeter weight, and/or cavity  25300  is located within or below a larger rear cavity defined by perimeter  25110 . Although cavity  25300  is located only at toe region  25210  in the present embodiment, there can be other embodiments where cavity  25300  may extend at least partially into heel region  25220   
     Back face  25100  also comprises stabilizing bar  25400  protruded from cavity base  25310  and extending diagonally relative to vertical axis  25290 . The length of stabilizing bar  25400  may extend fully or partially across cavity base  25310 , depending on the embodiment. As seen in  FIG. 25 , bar axis  25410  extends along a length of stabilizing bar  25400 , being intersected with vertical axis  25290 , and extending therefrom to the high toe portion of back face  25100 , towards toe end  25230  and top end  25250 . In some examples, a thickness or height of stabilizing bar  25400  from cavity base  25310 , and/or of other stabilizing bars of club head set  250 , may be of approximately 0.010 inch to approximately 0.25 inch. In the same or other examples, a width of stabilizing bar  25400 , and/or of other stabilizing bars or other club heads of club head set  250 , may be of approximately 0.050 inch to approximately 0.75 inch. In the same or other examples, the thickness or width of stabilizing bar  25400  may vary along its length, such as to increase or decrease towards the high toe portion of back face  25100 . In the present example, bar axis  25410  is angled at bar angle  25420  of approximately 43 degrees relative to vertical axis  25290 . There can be embodiments where the angle between vertical axis  25290  and bar axis  25410  may range from approximately 40 degrees to approximately 50 degrees. Depending on the club head, other club heads of club head set  250  may comprise bar angles, similar to bar angle  25420 , of approximately 25 degrees to approximately 65 degrees between their respective vertical and bar axes. 
     Skipping ahead in the figures,  FIG. 28  illustrates a top x-ray view of club head  25000  along strike path  28100  and poised to strike golf ball  28500 . In the present example, stability bar  25400  is angled at bar angle  25420  ( FIG. 25 ), relative to vertical axis  25290  ( FIG. 25 ), such that bar axis  25410  ( FIG. 25 ) is substantially aligned with strike path  28100  when club head  25000  is proximate to impact point  28600  with golf ball  28500 . As a result, stability bar  25400  is better positioned to receive, attenuate, and/or dissipate impact stresses and/or frequencies along its length upon impact with golf ball  28500  than if stability bar  25400  were aligned, for example, parallel or perpendicular to vertical axis  25290  ( FIG. 25 ). In addition, because the length of stability bar  25400  is aligned substantially parallel with strike path  28100 , when viewed from the top view of  FIG. 28 , stability bar  25400  may impart further consistency and directionality control to compel alignment of a flightpath of golf ball  2500  with strike path  28100 . 
     As can be seen from the top view of  FIG. 28 , stability bar  25400  is angled to be substantially aligned with flight path  28100  when club head  25000  is at a target open face impact angle  28700  while proximate to impact point  28600 . In some examples, one or more club heads may have stability bars similar to stability bar  25400 , angled for substantial alignment with flight path  28100  for target open face impact angles of approximately 30 degrees to approximately 50 degrees. There also can be other examples, however, where stability bars could instead be angled such as to be aligned with flight path  28100  when their club heads are square or are at closed face impact angles when proximate to impact point  28600 . 
     Backtracking to  FIG. 26 , club head  26000  comprises vertical axis  26290  similar to vertical axis  25290  ( FIG. 25 ) of club head  25000  ( FIG. 25 ), and stabilizing bar  26400  at cavity  26300 , similar to stabilizing bar  25400  ( FIG. 25 ). Stabilizing bar  26400  is angled, relative to vertical axis  26290 , at bar angle  26420 .  FIG. 27  shows club head  27000  comprising vertical axis  27290  similar to vertical axis  25290  ( FIG. 25 ) of club head  25000  ( FIG. 25 ), and stabilizing bar  27400  at cavity  27300 , similar to stabilizing bar  25400  ( FIG. 25 ). Stabilizing bar  27400  is angled, relative to vertical axis  27290 , at bar angle  27420 . 
     The club heads in  FIGS. 25-27  are each part of club head set  250 , but differ from each other by comprising different lofts. In the present example, the loft of club head  27000  ( FIG. 27 ) is greater than the loft of club head  26000  ( FIG. 26 ), and the loft of club head  26000  ( FIG. 26 ) is greater than the loft of club head  25000  ( FIG. 25 ). Club head set  250  is configured such that the bar angles of its club heads vary based on the loft of its clubs. For example, bar angle  27420  ( FIG. 27 ) is greater than bar angle  26420  ( FIG. 26 ), and bar angle  26420  ( FIG. 26 ) is greater than bar angle  25420  ( FIG. 25 ). Accordingly, stabilizing bar  26400  ( FIG. 26 ) will be substantially aligned with strike path  28100  ( FIG. 28 ) when club head  26000  is at a target open face impact face angle greater than target open face impact angle  28700  ( FIG. 28 ) of club head  25000  ( FIG. 25 ). Similarly, stabilizing bar  27400  ( FIG. 27 ) will be substantially aligned with strike path  28100  ( FIG. 28 ) when club head  27100  is at a target open face impact angle greater than the target open face impact angle described above for club head  26000  ( FIG. 26 ). 
     Consistent with the description above, in the present example, club head  25000  ( FIG. 25 ) comprises a loft of approximately 52 degrees, comprises bar angle  25420  of approximately 43 degrees, and is configured for a target open face impact angle  28700  of approximately 37 degrees. Club head  26000  ( FIG. 26 ) comprises a loft of approximately 56 degrees, comprises bar angle  26420  of approximately 44 degrees, and is configured for a target open face impact angle of approximately 38 degrees. Club head  27000  (FIG.  27 ) comprises a loft of approximately 60 degrees, comprises bar angle  27420  of approximately 47 degrees, and is configured for a target open face impact angle  28700  of approximately 42 degrees. 
     In the same or other embodiments, club head set  250  may comprise, in addition to, or instead of one or more of club heads  25000 ,  26000 , and/or  27000 , other club heads with different loft angles and corresponding characteristics. For instance, club head set  250  may comprise club heads with lofts of 50, 54, and/or 58 degrees, and/or lower lofted irons, with corresponding bar angle and target open face impact angle characteristics. 
     Several ranges can be implemented for the values described above. For example, there can be embodiments where club head  25000  ( FIG. 25 ), club head  26000  ( FIG. 26 ), club head  27000  ( FIG. 27 ), and/or another club head of club head set  250  can comprise a loft of approximately 45 degrees to approximately 70 degrees, can comprise a bar angle of approximately 40 degrees to approximately 50 degrees, and/or can be configured for a target open face impact angle of approximately 30 degrees to approximately 50 degrees. In the same or other embodiments, where lower lofted irons are included, the lofts may range from approximately 18 degrees to approximately 70 degrees, and the bar angles may range from approximately 25 degrees to 65 degrees. 
     As can be seen in  FIGS. 25-27 , the club heads of club head set  250  comprise hourglass supports towards the middle of their respective back faces. As an example, club head  25000  comprises hourglass support  25600  protruding from back face  25100 , where hourglass support  25600  comprises top portion  25630 , bottom portion  25640 , and middle portion  25650 . Hourglass support  25600  also comprises toe sidewall  25610  and heel sidewall  25620 , defining top portion  25630 , bottom portion  25640 , and middle portion  25650  therebetween. In the present example, cavity wall  25320  comprises toe sidewall  25610 , such that toe sidewall  25610  protrudes above cavity base  25310 . Also in the present example, the cavity wall  25720  of cavity  25700  comprises heel sidewall  25620 , such that heel sidewall  25620  protrudes above the cavity base of cavity  25700   
     Hourglass support  25600  can be configured to provide several benefits to club head  25000 . For example, by splitting the majority of its mass between top portion  25630  and bottom portion  25640 , middle portion  25650  is made relatively lighter. Such an arrangement provides for improved moment of inertia about middle portion  25650  to improve stability on center impact hits at the strike face opposite middle portion  25650 , and/or opposite cavities  25300  or  25700 . In addition, the mass of the top portion of the hourglass support, located high on club head  25000 , can be beneficial for positioning the center of gravity for optimal launch conditions and increasing moment of inertia. In some examples, middle portion  25650  of hourglass support  25600  can be located above a horizontal centerline  25280  of back face  25100 , thereby further raising the center of gravity of club head  25000 . Raising the center of gravity as described via hourglass support  25600  may provide for better launch control, permitting lower launch angles, and/or increased gear effect and ball spin, for a more stable golf ball flight path. In the same or other embodiments, top portion  25630  can be wider and/or thicker than bottom portion  25640  of hourglass support  25600 . 
     Toe sidewall  25610  of hourglass support  25600  comprises top segment  25611  that defines, at least in part, top portion  25630  of hourglass support  25600 . In the same or other examples, top segment  25611  is substantially parallel to stability bar  25400 . Such parallel relationship may permit top segment  25611 , and/or other parts of hourglass support  25600 , to act in conjunction with stability bar  25400  to better receive, attenuate, and/or dissipate impact stresses, vibrations, and/or frequencies, and/or to assist in imparting better golf ball directionality control when aligned relative to strike path  28100  ( FIG. 8 ). Toe sidewall  25610  also comprises bottom segment  25612  in the present example, defining at least in part bottom portion  25640  of hourglass support  25600 . In some examples, bottom segment  25612  can be substantially perpendicular to stability bar  25400 , and/or can be otherwise angled relative thereto. 
     Toe sidewall  25610  is substantially non-linear along middle portion  25650  of hourglass support  25600  in the present embodiment. In particular, in the present example, toe sidewall  25610  is angled thereat, approximating a “U” or “V” shape, such that an angle of approximately 80 degrees to approximately 100 degrees can exist between top portion  25611  and bottom portion  25612  of toe sidewall  25610 . 
     In the present example, back face  25100  also comprises cavity  25700  located at heel region  25220 . Cavity  25700  can be similar to cavity  25300 , but comprises cavity wall  25720  which includes heel sidewall  25620  of hourglass support  25600 . In  FIG. 25 , both of cavities  25700  and  25300  are located above horizontal centerline  25280 . In the present example, cavity  25700  is devoid of a stabilizing bar similar to stabilizing bar  25400 . There may be other embodiments, however, where a stabilizing bar could be provided at cavity  25700 , such as for club heads configured for closed face impact angles. In such examples where a stabilizing bar is provided at cavity  25700 , such stability bar may be parallel to a top segment of heel sidewall  25620  of hourglass support  25600 , parallel to the angle of stability bar  25400 , substantially perpendicular to the angle of stability bar  25400 , and/or otherwise angled, such as in alignment with a strike path of its club head while at a target face impact angle. In the same or other examples, where cavity  25700  comprises a stability bar, cavity  25300  may or may not comprise stability bar  25400 . 
     As can be seen in  FIGS. 25-27 , the club heads of club head set  250  also comprise respective toe weights that can vary depending on the loft angle of their club heads. For example, in  FIG. 25 , club head  25000  comprises toe weight  25800  located at toe region  25210  towards bottom end  25260 . Toe weight  25800  comprises weight surface  25810  facing towards heel region  25240 , where weight surface  25810  is angled relative to vertical axis  25290 . Similarly, in  FIG. 26 , club head  26000  comprises toe weight  26800  with weight surface  26810  angled relative to vertical axis  25290 , and in  FIG. 27 , club head  27000  comprises toe weight  27800  with weight surface  27810  angled relative to vertical axis  27290 . In the present example of club head set  250 , the angles of weight surfaces  25810  ( FIG. 25 ),  26810  ( FIG. 26 ), and  27810  ( FIG. 27 ) vary in accordance with the loft of their respective club heads, similar to the variation described above with respect to the angles of stability bars  25400  ( FIG. 25 ),  26400  ( FIG. 26 ) and  27400  ( FIG. 27 ). For example, where the loft of club head  27000  is greater than the loft of club head  26000  and where the loft of club head  26000  is greater than the loft of club head  25000 , the angle of weight surface  27810  relative to the vertical axis is greater than the angle of weight surface  26810  relative to the vertical axis, and the angle of weight surface  26810  relative to the vertical axis is greater than the angle of weight surface  25810  relative to the vertical axis. In the present example, the angled weight surfaces are aligned substantially parallel to their corresponding stabilizing bars, such that weight surface  25810  is substantially parallel to stabilizing bar  25400  ( FIG. 25 ), weight surface  26810  is substantially parallel to stabilizing bar  26400  ( FIG. 26 ), and weight surface  27810  is substantially parallel to stabilizing bar  27400  ( FIG. 27 ). In the same or other examples, such variation in the angles of the weight surfaces can provide benefits similar to those described above with respect to the variation between stabilizing bars  25400  ( FIG. 25 ),  26400  ( FIG. 26 ), and  27400  ( FIG. 27 ), such as by aligning weight surfaces  25810 ,  26810 ,  27810  with respective strike paths when their club heads are at respective target face impact angles. There may be other examples, however, where club heads of a club head set similar to club head set  250  need not comprise respective toe weights, or may comprise respective toe weights that do not necessarily vary depending on the loft angle of their club heads. 
     Continuing with the figures,  FIG. 29  illustrates a rear view of club head  29000 . Club head  29000  can be similar to club head  25000  ( FIG. 25 ), but comprises stabilizing bar  29400 . Stabilizing bar  29400  is similar to stabilizing bar  25400  ( FIG. 25 ), but increases in width towards a top toe end of club head  29000 . In the same or other examples, stabilizing bar  29400  can also, or alternatively, increase in thickness towards the top toe end of club head  29000 . In some examples, increasing the width or thickness of the stabilizing bar towards the top toe end of the club head can provide additional structural support to the high toe region thereof, and/or provide further reinforced area along a broader path aligned for impact with a golf ball. Such reinforcement can further reduce deformation and absorb further stresses at impact. Additionally, the increase width and/or thickness can position the center of gravity of the club head higher for increased spin rate and greater moment of inertia. 
       FIG. 30  illustrates a rear view of club head  30000 . Club head  30000  is similar to club head  25000  ( FIG. 25 ), but comprises stabilizing bars  30401  and  30402  rather than just a single stabilizing bar like stabilizing bar  25400  ( FIG. 25 ). In the present example, stabilizing bars  30404  and  30402  are angled as described above for stabilizing bar  25400  ( FIG. 25 ), but stabilizing bar  30401  is wider than stabilizing bar  30402 , and is located closer to the toe end of club head  30000  than stabilizing bar  30402 . In the same or other examples, stabilizing bar  30401  can be thicker or taller in addition to, or instead of, wider than stabilizing bar  30402 . Similarly, in the same or other examples, the widths of stabilizing bar  30401  and  30402  can be the same. In some embodiments, additional stabilizing bars can provide further structural support across the toe region of club head. While a single stabilizing bar provides reinforcement at a particular location, added bars can increase support over a larger cross section of the face. 
     Moving along,  FIG. 31  illustrates a flowchart of method  31000  for providing a golf club head set. In some examples, the golf club head set of method  31000  can be similar to golf club head set  250  described with respect to  FIGS. 25-28 , and/or to a golf club head set comprising club heads similar to those of  FIGS. 29 and/or 30 . The golf club head set may comprise one or more club heads comprising diagonal stabilizing bars. 
     Block  31100  of method  31000  comprises providing a first club head comprising a first diagonal stabilizing bar. In some examples, the first club head can be similar to one of the club heads of club head set  250  described above, such as club head  25000  ( FIG. 25 ), club head  29000  ( FIG. 29 ), or club head  30000  ( FIG. 30 ). A first vertical axis may be defined to extend through first top and first bottom ends of the first club head, and between first heel and first toe regions of the first club head. In some examples, the first vertical axis can be similar to vertical axis  25290  ( FIG. 25 ), and the first toe region can be similar to toe region  25210  ( FIG. 25 ). 
     Block  31100  can comprise sub-block  31110 , in some examples, for providing a first back face of the first club head. As an example, the first back face can be similar to back face  25100  of club head  25000  ( FIG. 25 ). The first back face can be located opposite a first strike face of the first club head. The first club head may be provided, for example, via a casting or forging process. 
     Next, block  31100  can comprise sub-block  31120  for providing a first cavity on the first back face at the first toe region of the first club head. The first cavity can be similar to first cavity  25300  ( FIG. 25 ), and may comprise a first cavity base similar to cavity base  25310 , and a first cavity wall bounding the first cavity base and similar to cavity wall  25320  ( FIG. 25 ). In some examples, a perimeter of the first club head may protrude above the first cavity base and/or define a portion of the first cavity wall, such as seen in  FIG. 25  with respect to perimeter  25110  protruding above cavity base  25310 . In the same or other examples, the first back face may be configured such that the first cavity is located only at the first toe region of the first club head. 
     Block  31100  of method  31000  can also comprise sub-block  31130  for providing the first diagonal stabilizing bar within and protruded from the first cavity, and angled at a first bar angle relative to a vertical axis of the first club head. The first diagonal stabilizing bar may be similar to stabilizing bar  25400  ( FIG. 25 ), and may comprise a first bar axis extending along a length of the first bar, similar to bar axis  25410  ( FIG. 25 ). The first bar axis can be aligned to intersect the first vertical axis, and to extend therefrom towards a high toe portion of the first club head. In some examples, the first diagonal stabilizing bar may be forged or cast with the first club head, and/or may be machined therefrom. There can be other examples where the first diagonal stabilizing bar does not comprise a single piece of material with the first back face. 
     There can be embodiments where the first bar axis can be angled at the first bar angle such that the first bar axis can be substantially aligned with a strike path of the first club head when the first club head is proximate to an impact point with a golf ball along the strike path. In some examples, such alignment of the first bar axis and/or the first stabilizing bar can be as described above with respect to  FIG. 28  for stabilizing bar  25400  relative to strike path  28100 . In the same or other examples, the alignment of the first bar axis and/or of the first stabilizing bar can be configured with respect to target face impact angles as described above with respect to the club heads of  FIGS. 25-28 . 
     There can also be embodiments with other configurations for the first diagonal stabilizing bar. As an example, in some embodiments, at least one of a thickness or a width of the first diagonal stabilizing bar may be configured to increase towards the first top end of the first club head, as described above with respect to  FIGS. 25 and 29 . As another example, a second diagonal stabilizing bar may be located in the first cavity, parallel to the first diagonal stabilizing bar, as described with respect to  FIG. 30 . In such examples, the second diagonal stabilizing bar may be thicker and/or wider than the first diagonal stabilizing bar, and can be located closer to the first toe end of the first club head than the first diagonal stabilizing bar. 
     In some examples, block  31100  may further comprise sub-block  31140  for providing a first hourglass support protruded from the first back face. There can be examples where the first hourglass support may be similar to hourglass support  25600  ( FIG. 25 ). The first hourglass support may be machined at the first back face in some examples, but there can also be examples where the first hourglass support need not comprise a single piece of material with the first back face. In some implementations, the first hourglass support may comprise top, bottom, and middle portions that may be respectively similar to top portion  25630 , bottom portion  25640 , and/or middle portion  25650  of hourglass support  25600  ( FIG. 25 ). The first hourglass support may also comprise heel and toe hourglass sidewalls, which may be respectively similar to heel sidewall  25620  and/or toe sidewall  25610  of hourglass support  25600  ( FIG. 25 ). In some embodiments, the toe hourglass sidewall may protrude above the first cavity of block  31120 , and/or may comprise a portion of the first cavity wall. There can also be examples where a top segment of the toe hourglass sidewall can be substantially parallel to the first bar axis of the first diagonal stabilizing bar. In the same or other examples, the toe hourglass sidewall can be non-linear along the middle hourglass portion of the first hourglass support, as seen for toe sidewall  25610  in  FIG. 25 . In the same or other embodiments, the heel hourglass sidewall may protrude above a second cavity of the first club head. For example, such second cavity can be located at the heel region of the first club head, and/or can be similar to cavity  25700  ( FIG. 25 ) in some embodiments. 
     Block  31100  may comprise, in some embodiments, sub-block  31150  for providing a first toe weight comprising a first weight surface angled at a first weight angle and facing a heel region of the first club head. The first toe weight can be located at the first toe region and towards the first bottom end of the first club head, and the first weight surface can face towards the first heel region at a first weight angle relative to the first vertical axis of the first club head. In some examples, the first toe weight can be similar to toe weight  25800 , and the first weight surface can be similar to weight surface  25810  ( FIG. 25 ). In the same or other example, the first toe weight can be similar to insert  895  ( FIG. 8 ), such as by comprising similar material(s). 
     In some examples, method  31000  can comprise block  31200  for providing a second club head comprising a second diagonal stabilizing bar. The second club head can be similar, in some examples to another one of the club heads of club head set  250 , such as one of club heads  26000  ( FIG. 26 ) or  27000  ( FIG. 27 ). 
     Block  31200  comprises sub-block  31210  for providing the second diagonal stabilizing bar angled at a second bar angle greater than the first bar angle. In some examples, the loft of the second club head of block  31200  can be greater than the loft of the first club head of block  31100 , such that bar angles increase with increasing lofts. In some embodiments, the second diagonal stabilizing bar can be similar to stabilizing bar  26400  at bar angle  26420  ( FIG. 26 ) 
     Block  31200  can also comprise, in some examples, sub-block  31220  for providing a second toe weight with a second weight surface angled at a second weight angle greater than the first weight angle. There can be embodiments where the second toe weight can be similar to toe weight  26800  with weight surface  26810 . 
     In some examples, one or more of the different blocks of method  31000  can be combined into a single block or performed simultaneously, and/or the sequence of such blocks can be changed. For example, sub-blocks  31120  and  31130  may be carried out concurrently with sub-block  31110  in some examples, such as when casting, forging, and/or machining the first club head. In the same or other examples, some of the blocks of method  31000  can be subdivided into several sub-blocks. For example, sub-block  31150  may comprise a sub-block for coupling the first toe weight to the first club head, such as by welding or via adhesives. There can also be examples where method  31000  can comprise further or different blocks. As an example, another block similar to block  31100  and/or corresponding sub-blocks  31110 ,  31120 ,  31130 ,  31140 , and/or  31150  may be provided for providing a third club head comprising a third diagonal stabilizing bar, such as for club head  27000  ( FIG. 27 ) or other club heads of club head set  250 . In addition, there may be examples where method  31000  can comprise only part of the steps described above. For instance, sub-block  31150  may be optional in some embodiments. Other variations can be implemented for method  31000  without departing from the scope of the present disclosure. Although the club head sets with varying characteristics and related methods have been described with reference to specific embodiments, various changes may be made without departing from the spirit or scope of the disclosure. Additional examples of such options and other embodiments have been given in the foregoing description. Accordingly, the disclosure herein of embodiments of club head sets with varying characteristics and related methods is intended to be illustrative of the scope of the present disclosure and is not intended to be limiting. For example, in one embodiment, a golf club head may have one or more features of  FIGS. 1-5 , with or without the other features described with reference to  FIGS. 1-5 . In another example, the club head sets described above with respect to  FIGS. 8-21  may comprise more or less club heads than those listed in  FIGS. 16 and 19 , and the loft angles, support bar characteristics, and/or lower toe insert weight attributes may differ from those in the examples of  FIGS. 8-21  while still being related to each other. As yet another example, club heads in accordance with the implementations discussed for  FIGS. 25-31  may have corresponding stabilizing bars of several shapes, such as rectangular, triangular, trapezoidal, circular, crescent, and/or rhomboid shapes, and/or may have corresponding stabilizing bars of several patterns, such as solid, waffle, dimpled, honeycomb, growth, and/or reduction patterns, while still embracing the teachings of the present disclosure. Other permutations of the different embodiments having one or more of the features of the various figures are likewise contemplated. It is intended that the scope of the club head sets with varying characteristics and related methods shall be limited only to the extent required by the appended claims. 
     The club head sets with varying characteristics and related methods discussed herein may be implemented in a variety of embodiments, and the foregoing discussion of these embodiments does not necessarily represent a complete description of all possible embodiments. Rather, the detailed description of the drawings, and the drawings themselves, disclose at least one preferred embodiment, and may disclose additional embodiments. 
     All elements claimed in any particular claim are essential to the club head sets with varying characteristics and related methods claimed in that particular claim. Consequently, replacement of one or more claimed elements constitutes reconstruction and not repair. Additionally, benefits, other advantages, and solutions to problems have been described with regard to specific embodiments. The benefits, advantages, solutions to problems, and any element or elements that may cause any benefit, advantage, or solution to occur or become more pronounced, however, are not to be construed as critical, required, or essential features or elements of any or all of the claims, unless such benefits, advantages, solutions, or elements are expressly stated in such claims. 
     Moreover, embodiments and limitations disclosed herein are not dedicated to the public under the doctrine of dedication if the embodiments and/or limitations: (1) are not expressly claimed in the claims; and (2) are or are potentially equivalents of express elements and/or limitations in the claims under the doctrine of equivalents.