Shimano XT M770 9-Speed Cassettes.Aluminum carrier reduces weight and increases rigidityItem SpecificationsColorSilverWeight264gIntended UseMountainCassette SpacingShimano/SRAM 9Cassette Body TypeShimano 9/10/SRAMCassette Cogs11,13,15,17,20,23,26,30,34Number of Speeds9Chain Compatibility9-SpeedRange11-34