amazon.com: grinding balls
Huanyu 1kg 304 Stainless Steel Grinding Balls for Lab Planetary Ball Mill (5mm) . Only 3 left in stock - order soon. Kutzall Original Sphere Rotary Burr, 1⁄4" Shaft, Fine - Woodworking Attachment for Bosch, DeWalt, Milwaukee, Makita Tools. Abrasive Tungsten Carbide Coating, 1" (25.4mm) Head Diameter, S-1G.