... 4.Manufactory type:CIP or Rolling Ceramic balls have characteristics of high strength, high density, high abrasion, entire specification,strong practicability ... ,25mm,30mm,40mm,50mm,60mm,70mm. Performance Index of Wear-resistant Alumina Ball Performance Index HXMM70 SeriesHXMM80 SeriesHXMH92 SeriesHXMH95 SeriesAl2O3(%)≥70≥80≥92 ...