The Mankind Vision Cassette Hub is a slim, low profile & lightweight cassette style. It's built with a 6061-T6 aluminium hub shell that's paired with a 14mm nickel chromoly hollow axle & utilises two precision sealed bearings that keep the hub running smooth. The Vision Hub also features a 1-piece, 9 tooth chromoly driver that uses polymer bushings & 4 pawls, an alloy cone on the non-driver side & a steel cone on the driver side with plastic DS & NDS hub guards included. section Product Specs HUB TYPE: Cassette AXLE: 14mm nickel chromoly hollow axle DRIVER: 9t DRIVE SIDE: Left Side Drive SPOKE HOLES: 36h WEIGHT: 469g (1.03lbs)