Bicycle coaster hub, model SC-HB-107, a rear hub with a back-pedal brake, offered with sprocket size 18/19/20T. Pedalling backwards applies the brake inside the hub, so the bicycle brakes from the pedals alone. Finish is Black / ZP, and spoke holes and axle length are made to order. Parts include the silver hub body on a threaded axle, a long brake arm, a black sprocket, a slotted metal strap, nuts, washers, rings and a small bolt.