... of its extreme low wear rate. B,high grinding efficiency 1.Advantages: A.Smooth surface,good sphericity .B.The beads have ... beads,5 times higher as Zirconium Silicate beads and 6-8 times higher as Al2O3 beads.D.Because of the high ... .4~φ0.6,φ0.6~φ0.8,φ0.8~φ1.0,φ1.0 ~φ1.2,φ1.2~φ1.4,φ1.4~φ1.6,φ1.6~φ1.8,φ1.8~φ2.0,φ2.0~φ2 ... strength: 900Mohs Hardness: 9 Zirconia Grinding Media Ceramic Beads (0.8)