The OpenGlide 1090 Red has been re-engineered and stripped down, yet it still remains a strong set of cogs that stick firmly to SRAM Red"s core principles of light weight, higher efficiency, and maximized technologies.PowerDome technology: 8 largest cogs are machined from one piece of chromoly steel, then given a nickel finishFits on Shimano-compatible 9- and 10-speed hubs, except Dura Ace and Shimano compitable 10-speed wheels that have tall cog splines on the freehub bodyOG 1090 design merges stiffness, durability, and simplicity in a revolutionary packageOpenGlide technology allows for the smoother transition between gears when up- and downshiftingStiffer, more durable and provides better power transfer than any other lightweight cassetteItem SpecificationsColorBlackIntended UseRoadCassette SpacingSRAM 10,Shimano RD 10Cassette Body TypeShimano 9/10/SRAMNumber of Speeds10Chain CompatibilityShimano 10,Campagnolo 10,SRAM 10Range11-25