Primo's Freemix Freecoaster Hub utilises durable KHE internals with an internal needle bearing, sitting behind the clutch to reduce drag when coasting backwards. The hub shell is made from 6061-T6 aluminium alloy & paired with a heat-treated hollow chromoly axle with a 6mm allen broach. It also features the proven spring & ball resistance sytem with spacer washers & thrust bearing, sealed bearings & chromoly cones. Please note: The Primo Freemix Comes with spare washers to adjust slack. When ordering let us know in the special instructions whether you would like the gap setup either large, medium or small & we can adjust this for you. Primo freecoasters are very tricky to adjust & we only recommend adjusting if you know what your doing. section Product Specs HUB TYPE: Freecoaster AXLE: 14mm Male DRIVER: 9t DRIVE SIDE: Right Side Drive SPOKE HOLES: 36h WEIGHT: 715g (1.58lbs)