Martin timing pulleys are manufactured to extremely close specifications and are stocked in minimum plain bore, Taper Bushed, Q.D. Bushed styles depending on size and pitch. Synchronous sprockets are non-slip toothed drives that require no lubrication. These sprockets have a wide speed range, are very efficient and make less noise than chain drives. Teeth on the belts are molded to conform with and engage the teeth on a mating sprocket.