Shimano HG80 9-Speed Cassettes.Aluminum carrier for three largest sprocketsItem SpecificationsColorNickel/ChromeWeight230gIntended UseMountainCassette SpacingShimano/SRAM 9Cassette Body TypeShimano 9/10/SRAMCassette Cogs11,12,13,14,16,18,21,24,28Number of Speeds9Chain Compatibility9-SpeedRange11-28