Protects the rear of your shaft from impacts and cracking Compatible with Easton X10 and X10 ProTour Weight: 3 grain Fitment: #1 Fits all X10 spine sizes #2 Fits 770-670 spine X10 Pro Tours #3 Fits 620-520 spine X10 Pro Tours #4 Fits 470-420 spine X10 Pro Tours #5 Fits 380-340 spine X10 Pro Tours