Eclat's latest hub is based on the popular Cortex Coaster Hub but this one takes on the Cassette style. It's built from a 6061-T6 alloy hub shell that's paired with a hardened 14mm chromoly male axle that features a hex key inner axle for strength, durability & easy maintenance. It also features two high quality hub bearings with three durable driver bearings to keep everything rolling smooth. The Eclat Cortex Cassette comes with nylon Viper & Gong drive & non-drive side guards. section Product Specs HUB TYPE: Cassette AXLE: 14mm Male DRIVER: 9t DRIVE SIDE: Right Side Drive SPOKE HOLES: 36h WEIGHT: 608g (1.34lbs)