The XX SL Eagle Transmission (T-Type) Cassette is a major reason why Eagle Transmission offers the best-ever inboard and outboard shifting performance under load. Thanks to its full X-SYNC design, the harder you pedal, the better it shifts. Fully machined, hardened steel X-Dome architecture for gears 1-9 and an ultra-lightweight, all-aluminum Spider Cog for gears 10-12. Engineered as integrated and interdependent transmission components, the XX Eagle Transmission Cassette and derailleur contact directly, ensuring perfect alignment on every bike. New-gen design is SRAM&';s lightest ever 10-52T cassette due to the ultra-lightweight, all-aluminum Spider Cog. Full X-SYNC for best-ever inboard and outboard shifting performance under load. Optimized gear steps on low end. XD Driver BodySRAM Model ID: CS-XS-1299-A1 TECH SPECS Cog Material Steel/Aluminum Cog Details 101214161821242832384452 Finish Silver/Black Range 10-52T Speed 12 Cassette Spider Mat. Steel/Aluminum table{border-collapse:collapse;width:100%;}td{text-align: left;padding: 8px;}tr:nth-child(even){background-color:#f2f2f2}th{background-color:#eb212e;color:white;text-align:left;padding:8px;}