6061-T6 aluminum hub shell with two precision-sealed 6903 cartridge bearings. 14mm 4130 chromoly hollow male axle with 6mm hex broach and 17mm chromoly axle nuts. 9th chromoly 3-pawl driver with three precision-sealed 6802 cartridge bearings. Driver can be switch between RHD and LHD. Includes non-drive side plastic hub guard (compatible with other Odyssey/Gsport cassette hubs). 36 hole.