... .we are the pioneer of ceramic bearing in China 2.material is SSiC 3.full ceramic bearing 4.we are manufacturer ... ,low temp,electric insulation,high precision ballscrew set,valve balls for acid,alkali,salt,measure pumps,flowmeter.Characterisitic:resistance ... alkali,salt and gas of deleterious, especially resistance to hydrofluoric acid,long life,high hardness,resistance to wear. ceramic balls(SiC)