... . 2. Good quality ceramic bearings. 3. Ceramic bearings, of long life, with high precision. 1) Ceramic bearings: Special 639 ceramic bearings of high precision ... rating: P0, P6, P5, P4, P2.8) Logo: We can mould, print or laser your logo on the product according to ... your request.9) Packaging: Wooden package, carton package. Special 639 ceramic bearings of high precision