Shimano SLX HG81 10-Speed Cassettes feature rider optimized gear progressions.Optimized tooth profiles for HG-X chain and Shadow rear derailleurThree rings on spiderItem SpecificationsIntended UseMountainCassette SpacingShim/SRAM MTN 10Cassette Body TypeShimano 9/10/SRAMCassette Cogs11-34Number of Speeds10Chain CompatibilityDyna-SysRange11-34