SRAM Crank Boots For XX1/X01 CranksDeveloped for use with SRAM XX1 and X01 cranks, these crank boots fit over the top of each crankarm and protect the ends against knocks and bumps from trailside obstacles. This makes them a durable upgrade for giving your crankarm ends extra protection as you charge through rock gardens, tree roots and debris. Comes as a pair.Features: Use: Mountain Bike (MTB) Compatibility: SRAM XX1/X01 cranks Single or Pair: PairBuy SRAM Components from Chain Reaction Cycles, the World’s Largest Online Bike Store.