Take a quick look at the new X-DOME™ Eagle™ cassette. The last dangling shred of an argument in favor of a mountain bike front derailleur is now officially dead. Designed for use with our proven, reliable XD™ driver body, this 12-speed, 10- to 50-tooth cassette offers an optimal 500-percent gear range at a considerably lighter weight than 2x systems. It carries with it the X-DOME™ architecture, which, independent tests have concluded, yields the strongest cassettes on the market. New shifting characteristics improve both, inboard and outboard shifting, as well as chain retention.SRAM’s cassette manufacturing technology gives the greatest durability and lightest weight,All-new shifting features create a smoother, quieter system with enhanced inboard and outboard shift performance,XD™ driver body compatible,10, 12, 14, 16, 18, 21, 24, 28, 32, 36, 42, 50.SpecificationsTechnology Highlights: X-DOME™, XD™ driver body, X-GLIDE™ 2Material: Same as XX1, machined cromoly 11t cog cluster with aluminum 50t cogGear Ratios: 10-50tSpeeds: 12Colors: BlackRecommended Chain: Eagle™ chain OnlyRecommended Group: X01 Eagle™Cogs: 10-50t: 10t, 12t, 14t, 16t, 18t, 21t, 24t, 28t, 32t, 36t, 42t, 50tOther: Cogs on Cluster: 11Compatibility: 12-speed XD™ driver body compatible