... , PP polypropylene plastic ball is mainly used in cars, sensor, valves, pumps, valves, bathroom, electronic, bearing, electric appliances, and other industries. We ... choose! Mainly used in cars, plastic ball valves, pumps, sensor, wei yu, electronic, ball valves, bearings, electric appliances, and other industries. Plastic ... work together to create brilliant! 6.35mm POM ball in valves