The Salt EX Cassette Hub is a fully sealed hub that's got everything you could need in a cassette hub. Built from durable alloy for the shell with a 14mm chromoly axle making the EX really tough & durable, with sealed bearings throughout keeping the hub rolling smooth. The Salt EX Hub also features a 9 tooth 1-piece driver with 3 sealed bearings & a C-clip, CNC machined cones & a slim low flange style. section Product Specs HUB TYPE: Cassette AXLE: 14mm Male DRIVER: 9t DRIVE SIDE: Left Side Drive SPOKE HOLES: 36h WEIGHT: 584g (1.29lbs)