9mm = 3.00 grams per ball. 2mm = 0.03 grams per ball. 7mm = 1.40 grams per ball. 3mm = 0.11 grams per ball. - Stainless Steel Ball Bearings -. 6mm = 0.90 grams per ball. 1mm = 0.004 grams per ball. 8mm = 2.02 grams per ball.
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