bearing 1.High precision,long life,low noise 2. ... , DB, DF, ETC. ISO 9001-2000 certificated Material: bearing steel, carbon steel, stainless steel. Etc. Precision: P0 P5 P6 Retainer: copper cage, ... nylon retainer, steel retainer, Bakelite retainer, etcdifferent types. such as 60 series, ... 160series etc. for more information, please contact us ball bearing