12-speed Eagle Transmission, gear 1 made of aluminum, gears 2 - 3 made of stamped steel, gears 4 - 12 made of fully machined, hardened steel, chainline 55 mm, suitable for XD freehub body, black / silver Article Type Construction 3 packs Cassette mount E-Bike type ready Freehub body XD Large sprocket 52 T. Main color silver Small sprocket 10 T. Secondary color black Sprocket replaceable no System compatibility 12-speed Technology X-Dome The XX Eagle Transmission (T-Type) cassette is one of the main reasons why Eagle Transmission offers the best shifting performance under high load. Thanks to the full X-Sync design, the cassette shifts better when pedaling harder. The XX Eagle Transmission cassette and derailleur are designed as integrated and interdependent transmission components and make direct contact, ensuring perfect alignment on any bike. 10-52t: 10,12,14,16,18,21,24,28,32,38,44,52X-SYNC for excellent shifting performance under loadOptimized shifting steps in the low end55 mm chainline compatibility for more moderate chain angle and lower wearSetup sprocket for foolproof adjustmentFeatures X-DOME with a lighter aluminum 12th sprocketSram Article number: 732952 EAN code: 710845891441 Supplier number: 00.2418.125.000 Retail packaging: Yes