The SunRace MX8 is an 11-speed cassette that is designed to be the perfect solution for riders that don t want to resort to an expensive expander sprocket and want a smooth, clean shift between gears. This 11-speed cassette offers an even and smooth shifting performance between all sprockets. 6 sprockets on this SunRace MX8 11-Speed Shimano/SRAM compatible cassette are on two alloy spider carriers for strength and durability.