... Ball In accordance with the different content of AL2O3, it can be divide 1. Inert Alumina Ceramic BallIn accordance with the different content of AL2O3 ... increase performance, reliability and life of bearings.Size(Inch):1/32, 1/16, 3/32, 5/32, 3/16, 7/32, 15/64 ... , 1/4, 17/64, 9/32, 5/16, 11/32, 3/8, 7/16, 31 ... /64, 1/2, 17/32, 9/16, 19/32, 5/8, 11/16, 3/4, 1, 5/4 ceramic ball