... Insert ball bearingCeramic ball bearing especially ZrO2 have the following performance as low density, high strength, low friction coefficient, electrical and magnetism ... when working, it's the best choice for rollers (inner ring and outer ring are made by metal) of the ... applications, Medicine equipment, wet applications Contact info:Jinan Yuki Bearing Co., Ltd. 5A-002,BinFenWuZhou,No.96 Jiluo Road, ...