1.we are the pioneer of ceramic bearing in China 2.material isZrO2 3.full ceramic bearing 4.we are manufacturer ZrO2:Usage ... temp,low temp,electric insulation,high precision ballscrew set,valve balls for acid,alkali,salt,measure pumps,flowmeter and valve ball ... ,high hardness,especially resistance to wear,high modulus of elasticity ceramic ZrO2 balls (ZrO2 bearing)