The Mission Engage is an affordable cassette hub with five precision sealed bearings & a tough heat-treated chromoly straight axle. The driver is a 3-bearing, 3-pawl design for added durability & consistent engagement. The straight axle design assures plenty of length for hub guards & all peg types. section Product Specs HUB TYPE: Cassette AXLE: 14mm Heat-Treated Chromoly DRIVER: 9 Tooth SPOKE HOLES: 36 WEIGHT: 20.3oz