SRAM Power Glide II PG-1070 10-Speed Cassettes fit Shimano-compatible freehub bodies.Steel Cogs with shiny weather-resistant finishLargest three cogs are attached to an aluminum spiderCompatible with all 10 speed chains; use SRAM chains for optimum performanceItem SpecificationsColorChromeWeight209gIntended UseRoadCassette SpacingSRAM 10,Shimano RD 10Cassette Body TypeShimano 9/10/SRAMCassette Cogs11,12,13,14,15,17,19,21,23,25Number of Speeds10Chain CompatibilityShimano 10,SRAM 10Range11-25