Ceramic Grinding Media Agate Balls 1-25mm Agate grinding balls are polished spheres used as ceramic grinding media in ball mill jars. Their dense, hard structure and chemically inert nature make them ideal for low contamination sample preparation in laboratories. Key Features Agate material, chemically inert Low contamination for sensitive samples Hard and wear resistant polished surface Available from 5mm to 25mm Ideal for laboratory ball mill jars Technical Specifications