Simar Rulman has adopted imported plastic, which is super tough and electrically conductive. It can release static electricity to prevent fragmentation during assembly and transportation. In addition, our pulley bearings are specially designed and manufactured to be molded once, so they are more tolerant of heavy pressure during assembly, offset the impact of the heavy load of goods on conveyor rollers, and increase the turning flexibility of the plastic wheels. As a result, the rotational speed of our pulley bearings matches that of conveyor rollers perfectly, helping to save labor and materials as well as optimizing workflow.