Protects the rear of your shaft from impacts and cracking Compatible with Easton Ace, ProComp, Avance, Avance Sport, SuperDrive Micro, 4mm FMJ, 4mm Axis, and AC ProComp Weight: 3 grains Quantity: 12-pack Fitment: 4mm Superdrive Micro #2: 950, 850, 750, 675, 625 #3: 575, 525, 475 #4: 425, 375 #5: 325 4mm Axis #4: 400 #5: 340 #6: 300 #7: 250 4mm FMJ #5: 400 #6: 340 #7: 300 #8: 250 4mm X10 Parallel Pro #1: 1150, 1000, 880 #2: 810, 710, 660, 610, 520 #3: 570, 470 #4: 420, 380, 340 #5: 300 #7: 250 4mm Ace #1: All Spines 4mm Avance Series #1: 2000, 1800, 1600, 1400 #2: 1150, 1000, 900, 810 #3: 730, 660 #4: 600, 550, 500, 450 #5: 400 #7: 340