Ratchet freehub bodies have a gloss finish and don&';t have a seal, as this is fixed on the hub shell. The Ratchet System was the first of this type for DT Swiss; used in the mid-range products like the 350 hubs. Fits SRAM XDR 12-speed cassette types Crafted from lightweight aluminum Compatible with 12mm thru-axles Includes end cap for 12 x 142 hubs Weight: 46 g ADDITIONAL INFORMATION Rear Hub Spacing (mm) 142 Material Aluminum Cassette Body Type SRAM XDR , SRAM XD 11/12 Speed Rear Axle Type 12mm Thru-axle