Ceramic Ball, Material Ceramic, Material Grade 10, Outside Diameter 1/4 in, Outside Diameter Tolerance +/-0.00005 in, Ball Weight 0.704 g, Vickers Hardness 1,600, Standards ASTM F2094 Class 2, Maximum Temperature 1,800 Degrees F, Application Aerospace, Shape Ball, System of Measurement Inch, Package Quantity 10