STOUT CASSETTE: Forged and CNC machined alloy hub body, 14mm hollow chromoly axle, Four sealed bearings (2 in hub, 2 in cassette), Lightweight asymmetrical design CNC'ed chromoly 17mm axle nuts, CNC'ed non-drive flange design protects spokes from grinds, LSD and RSD designs available 9-tooth forged and CNC'ed chromoly driver, 11T driver available separately, Color: Black, Weight: 16 oz. (458g)