... ,2RS In machinery 6007 Plastic Ball Bearing:This bearing is a self-lubricated bearing material,based on bronze expanded metal mesh ... Zinc plated, nickel plated, Chrome plated, Rubber casting, Plastic coated, etc.2, Other waterproof/antirust bearings:Ceramic bearingsPlastic bearingsHybrid ... , agricultural machinery, construction machinery, construction machinery, and so on. 6007 Plastic Ball Bearing