The Black Inc XDR Driver Freehub Body ensures that any Black Inc wheel can run with the SRAM drivetrain. The aluminium body is durable and lightweight, ideal for anyone looking for the lightest possible wheel build. The XDR Driver Freehub is constructed with CeramicSpeed ceramic Bearings. Black Inc works directly with CeramicSpeed for all hubs, which is why we offer the XDR with ceramic bearings as an option.