1.we are the pioneer of ceramic bearing in China 2.material isSSiC 3.full ceramic bearing 4.we are manufacturer SSiC:Usage: high precision,high speed,vacuum,fixed anode X-ray tube,high temp,low temp,electric insulation,high precision ballscrew set,valve balls for acid,alkali,salt,measure pumps,flowmeter.Characterisitic:resistance to strong acid,strong alkali,salt and gas of deleterious, ...