The revolutionary machined design of the XX Cassette uses the same grueling manufacturing techniques that produced the PowerDome road cassette. With X-Dome, eight of the cogs are CNC-machined together out of a single block of billet steel, creating an incredibly lightweight, precise, and strong cassette. The open design aids in mud clearance, giving you cleaner shifting performance and longer component life. Cog structure has lots of spaces for mud to flow so it won"t pack upX-Glide shifting, X-Dome designAluminum large cog can be replaced as neededRecommended chains are PC-1090 and PC-1090RItem SpecificationsColorSilverWeight208gIntended UseMountainDrivetrain SpacingShimano/SRAM 10Cassette Body TypeShimano 9/10/SRAMCassette Cogs11,2,4,6,8,20,2,5,8,32Speeds10Chain CompatibilityShim/SRAM 10