... content of AL2O3, it can be divided into the specification as follows: Common Ceramic Ball, Inert Alumina Ceramic Ball, Medium-Alumina Ceramic Ball, High-AluminaCeramic Ball and ... , 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 ...