Ceramic balls provided by SunYoung Industry have the following features: 1) Materials: silicon nitride (Si3N4), Zirconia (ZrO2), Alumina (Al2O3) 2) Application: for bearings, inspection, pumps, and other rolling conditions 3) Capacity: 3,000,000pcs/month for 5/32" silicon nitride balls 4) Diameter: 1/64" ~ 2" 5) Precision: G3 ~ G20 Specifications (compare to steel): (1) Lighter than steel; (2) Lower friction coefficient, rolls more freely; (3) Larger elastic modulus; (4) Lower coefficient of thermal expansion; (5) Superior surface finish; (6) Higher high-temperature hardness; (7) Never rust, and can roll without oil or grease; (8) Better corrosion resistant than steel.