... ideal choice as grinding mediums.1.Name: HNCC Ceramic Ball, HNCC Zirconia Ball, Best grinding Medium, HNCC Zirconia Ceramic Ball2.Material Superfine ... ISO9001,ISO140014.Density: ≥5.95 g/cm35.Properties Zirconia Ceramic ball possesses High grinding efficiency, High hardness, corrosion resistant, High fracture ... ,I will try my best to service you. Zirconia Ceramic Ball Grinding Media