nylon pulley, plsatic roller, pulley wheel we have more than 14 years in manufacturing nylon pulley, warmly welcome your visit nylon pulley, plsatic roller, pulley wheel1, The plastic pulley outer ring is produced of plastic materials (POM, PP, PA, nylon), with excellent surface for sliding windows and doors.2, The inner ring is produced of carbon steel with zinc plated, with excellent anti-rust ...