... ,38,50mm 3.ISO 9001:2008 4.Acid resisitance(%):>99.6% Hardness-9.5 Grinding Ceramic Ball, Inert White ... ball as catalyst support media Al2O3:17%-99.5%Size: 3,6,9,13,19,25,38,50MMVODA Inert ... (13mm)>1.5>1.67>1.56>1.99>33/4 inch (19mm)>4.15>4.21> ... 2.89>3.21>51 inch (25mm)>6.07>6.22>4.89>5.33>81-1/2 ... area, ideas of design and all your private information.6. For fast services, pls add my Skype: ivyhulp ...