Plastic Bearings features: 1) Material of rings and retainer: PEEK, POM, PA66, PI, HDPE, PVDF, ABS, PP and PBT 2) Material of balls: ZrO2, Si3N4, stainless and glass.ceramic Bearings with ceramic balls has following characteristics: 1) Chemical resistant. Can work in various chemicals. 2) No need lubrication, clean, and can wash in the water. 3) Non-magnetic and insulation. Reliable working. 4) Constant working in high temperature till 400 Centigrade . 5) Light weight. 6) Outstanding long time working in low temperature till -80 centigrade. 7) Tolerance is as per normal bearings. Easy for assembly.Application is as under: Electro plating, electro polishing ,Food processing, vacuum applications.Fiber processing, conveyor processing. Medical radiation, photo processing,Computer assembly, electronics applications, Medicine equipment, wet applications.