1、High rigidity, high strength and high hardness. 2、Strong corrosion resistance, can be used in strong acid and strong alkali. 3、High temperature resistant, silicon nitride ceramic balls under 1000℃environment can be normally used. 4、Low density (3.2g/cm3), about 60% lighter than steel ball, reducing wear and noise. 5、The low linear expansion coefficient (3.2 x 10-6/K), almost 1/4 of bearing steel, can withstand the rapid change of temperature Silicon Nitride ceramic ball enjoys high ceramic strength, good wear resistance, high stiffness, corrosion resistance, high temperature resistance, electrical insulation, Low magnetic conductivity and small proportion and other performance which metal material don't have. Suitable for rolling body of special ceramic bearing. Features: High rigidity, high strength and high hardness. Strong corrosion resistance, can be used in strong acid and strong alkali. High temperature resistant, silicon nitride ceramic balls under 1000℃environment can be normally used. Low density (3.2g/cm3), about 60% lighter than steel ball, reducing wear and noise. The low linear expansion coefficient (3.2 x 10-6/K), almost 1/4 of bearing steel, can withstand the rapid change of temperature Self-lubricity, can solve the pollution caused by the lubrication medium and inconvenient addition,Can be used in vacuum and high temperature. Drug resistance, high mechanical strength. Application: high temperature bearing, corrosion resistant bearing, chemical pump, ceramic valve ball. Specification: Material: Silicon Nitride Accuracy level: G10 Size range: 4.763/5.0/5.953/6.35mm(Optional) Weight: 30 - 34 g / 1.1- 1.2 oz(approx.) Package list: 10 x Bearing Ball