The Halo MXR rear hub is the hub used in the Matt Priest pro wheels which uses a 120 point triple wedge pawl drive Supa Drive system & features a 14mm hollow Cr-Mo axle & bushed bearing mini threaded 9t driver. This hub almost instantaneous pick up & a fantastic sound section Product Specs HUB TYPE: Cassette AXLE: 14mm Male DRIVER: 9t SPOKE HOLES: 36h WEIGHT: 383g / 13.5oz