... line and furniture. Pulley wheel bearings 1)Plastic pulley outer ring is made of plastic materials (POM, PP, PA, nylon), ... , with excellent resistance to corrosion capacity3) Color of plastic outer ring: according to customers' requirements4) With long life performanceWindow ... material according to customers' requirements2) The rollers outer ring is made of plastic materials (POM, PP, PA, nylon) or ...