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.Features:- SRAM?s cassette manufacturing technology provides 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 compatibleSpecifications:- Material: Same as XX1, machined cromoly 11t cog cluster with aluminum 50t cog- Gear Ratios: 10-50t- Speeds: 12- Recommended Chain: Eagle? chain - Recommended Group: XX1 Eagle?- Cogs: 10-50t: 10t, 12t, 14t, 16t, 18t, 21t, 24t, 28t, 32t, 36t, 42t, 50t- Other: Cogs on Cluster: 11- Compatibility: 12-speed XD? driver body compatibleTechnology:X-Dome: - X-DOME technology creates an incredibly lightweight, precise and strong cassette. The open design aids in mud clearance, giving you cleaner shifting performance and longer component life.X-Glide 2:- X-Glide™ 2 is next generation of SRAM X-Glide™ technology optimized for the EAGLE? 12-speed cassette. It provides quick, precise, power-on shifting performance throughout the gear range, and increases chain retention on larger cogs.XD Driver Body:- XD is a new cassette driver body design that allows the use of a 10 tooth small cog and provides an improved interface with the cassette.