Box components Box Three Prime 9 X-Wide 9 speed black rear derailleur

Prime 9 Technology is a counter-intuitive philosophy based on the less is more theory - it embraces range without adding complexity. Intended for use with Box Components` Prime 9 speed group no compatible with other 11-50 cassettes. Similar design as the Box Two Prime 9 derailleur with more affordable materials. Glass fiber/nylon composite steel and aluminum construction. Limited slip clutch. Stamped inner and outer cage. Standard bushing pulleys. Direct channal cable stay