Low prices for fun outdoors. . BAOSHISHAN 1000g Zirconia Grinding Balls 15mm Zirconium Oxide Beads Ultrafine for Lab Planetary Ball Mill 15mm 5.0 out of 5 stars 3. 109.00 109. 00. 5 coupon applied at checkout Save 5 with coupon. . White Ceramic Grinding Balls - Size 20mm - Weight 1kg - Milling Media for Ball Mill - by Inoxia. 3.9 .