Features of the Shimano XT CS-M8000 Cassette Improved driving efficiency and stable shifting Shave bike weight off without sacrificing durability or reliability Optimal balance of lightweight and durability Ride anywhere with smooth and precise gear changes Combination of aluminum (40T) and steel gears Optimized gear combination and gear ratio Wide cassette sprocket 11-40T Rhythm step gear progression Specifications Generation: Deore XT M8000 Number of speeds: 11 Cassette or freewheel: Cassette Finish: Anodized Average weight: 411 g (11-40T) 434 g (11-42T) 437 g (11-46T) Combination name(Group name): 11-40T (bs) 11-42T (bt) 11-46T (bu) Compatible chain: HG-x11 Speeds: 11-speed Spider arm_QTY (pcs): 2 Type: HG