Eclat's Cortex Hub is now available as a cassette style. It's a very high-quality cassette hub packed with pro level features. The Cortex Cassette features a 6061-T6 alloy hub shell with a hardened chromoly 14mm male axle with a hex key inner axle for really easy maintenance. It also features two high quality hub bearings with three durable driver bearings, each hub comes with nylon Viper & Gong drive & non driveside hub guards for even more street protection section Product Specs HUB TYPE: Cassette AXLE: 14mm Male DRIVER: 9t DRIVE SIDE: Left Side Drive SPOKE HOLES: 36h WEIGHT: 598.7g (1.32lbs)