This product are featured by high density and hardness, low wear lost, corrosion-resistance etc. They are the perfect high-efficient grinding media for milling glaze/frit, pigment, ceramic materials, and various mine ore powder, they are using ceramics, cements, paints, refractories, inorganic mineral powders etc... 90% Almina Grinding Ball A) Al2O3 > 90% B) Water absorption <0.01% C) Bulk density >3.60 g/cm3 D) Mosh hardness: 9 E) Color: White Standard: Dia 30-60mm