... . size:3,6,9,13,19,25,38,50mm Inert Ceramic Balls as Catayst Supports The 23-25% Al2O3 Inert Alumina ... Ceramic Balls are used as catalyst, absorbent, desiccant and drying agent ... -1/2''(38mm)>1300>132''(50mm)>5700>57 Inert Alumina Ceramic balls