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Description:Ceramic balls provided by SunYoung Industry have the following features: 1) Material: Silicon Nitride(Si3N4), Zirconia(ZrO2), Aluminum Oxide(Al2O3) 2) Usage: 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) Larger elastic modulus 3) Lower friction coefficient, rolls more freely 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