IRQ 31Inch Archery Fiberglass Arrows for Compound Bow Recurve Bow Screw in Changeable Points Target Practice Arrows 12 Pack Fiberglass shaft length about 31'' (80cm) ; Screw in replacement arrow tips 100grain;3 inch plastic vanes, Spine: 600-650 Extraordinary durability fiberglass material,will not easily splinter Nocks is not fixed,can be rotated to adjust for your bows Targeting arrows for compound bows,recurve bows,traditional longbow draw weight 30-60lbs Perfect archery hunting arrows,target arrows,beginner arrows for shooting and targeting.