A putter type golf club head comprising: an upper portion and a lower portion; wherein the upper portion is made from a first material having a first density and the lower portion is made from a second material having a second density; wherein the first density is less than the second density; the lower portion comprises a front periphery, a toe side periphery, a heel side periphery, and a rear periphery; wherein the lower portion further comprises an aperture bounded by the front periphery, toe side periphery, heel side periphery, and rear periphery; the upper portion comprises a heel end, a toe end, a strike face, a rear wall, a back edge, a crown, and an under surface; wherein the toe end is opposite the heel end, the back edge is opposite the strike face; the crown extends away from the strike face, over at least a portion of the rear wall, and to the back edge; the under surface is opposite the crown spanning from the strike face to the back edge; the upper portion is affixed to the lower portion, and is farther from a ground plane than the lower portion, wherein the heel end overlays at least a portion of the heel side periphery, the toe end overlays at least a portion of the toe side periphery, the strike face overlays at least a portion of the front periphery, and the crown spans from the strike face to the rear periphery; the lower portion and upper portion combine to create a sole; wherein the sole is tangent to the ground plane, when the golf club head is at an address position; the strike face is tangent to a loft plane, wherein a loft angle formed between the loft plane and the ground plane; a volume and a mass; wherein the lower portion comprises less than 30% of the volume of the golf club head; and wherein the lower portion comprises greater than 50% of the mass of the golf club head. an upper portion and a lower portion; wherein the upper portion is made from a first material having a first density and the lower portion is made from a second material having a second density; wherein the first density is less than the second density; the lower portion comprises a front periphery, a toe side periphery, a heel side periphery, and a rear periphery; wherein the lower portion further comprises an aperture bounded by the front periphery, toe side periphery, heel side periphery, and rear periphery; the upper portion comprises a heel end, a toe end, a strike face, a rear wall, a back edge, a crown, and an under surface; wherein the toe end is opposite the heel end, the back edge is opposite the strike face; the crown extends away from the strike face, over at least a portion of the rear wall, and to the back edge; the under surface is opposite the crown spanning from the strike face to the back edge; wherein the toe end is opposite the heel end, the back edge is opposite the strike face; the crown extends away from the strike face, over at least a portion of the rear wall, and to the back edge; the under surface is opposite the crown spanning from the strike face to the back edge; the upper portion is affixed to the lower portion, and is farther from a ground plane than the lower portion, wherein the heel end overlays at least a portion of the heel side periphery, the toe end overlays at least a portion of the toe side periphery, the strike face overlays at least a portion of the front periphery, and the crown spans from the strike face to the rear periphery; the lower portion and upper portion combine to create a sole; wherein the sole is tangent to the ground plane, when the golf club head is at an address position; the strike face is tangent to a loft plane, wherein a loft angle formed between the loft plane and the ground plane; a volume and a mass; wherein the lower portion comprises less than 30% of the volume of the golf club head; and wherein the lower portion comprises greater than 50% of the mass of the golf club head. wherein the lower portion comprises less than 30% of the volume of the golf club head; and wherein the lower portion comprises greater than 50% of the mass of the golf club head.