Ratchet EXP freehub bodies have a matte finish. These are available in two different versions, with ceramic bearings for the 180 hub and with steel bearings for the 240. Ratchet EXP freehub bodies have no seal themselves, as this sits on the hub shell. FEATURES : Steel Bearings, Compatible with 240 series hubs End Cap Included SPECS : Rear Hub Spacing (mm): 142 Material: Aluminum Cassette Body Type: SRAM XDR , SRAM XD 11/12 Speed Rear Axle Type: 12mm Thru-axle