New-gen design is Sram`s lightest ever 10-52T cassette due to the ultra-lightweight, all-aluminum Spider CogFully machined, hardened steel X-Dome architecture for gears 1-9 and an ultra-lightweight, all-aluminum Spider Cog for gears 10-12Full X-SYNC for best-ever inboard and outboard shifting performance under load with optimized gear steps on the low end55mm chainline compatibility for more moderate chain angle, longer wear and greater precisionFeaturing a clearly marked Setup Cog, install is both simple and fool-proofUtilizes well accepted and broadly available XD driverbody10-52t12sp10,12,14,16,18,21,24,28,32,38,44,52Black/SilverXDUPC/EAN/GTIN: 710845891434