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Wholesale 99.9% Pure Copper Balls Corrosion Resistant Solid Bearings Ball 3.5mm 3.969mm 4mm G100 G1000, Find Details and Price about 99.9% Pure Copper Balls Copper Ball from Wholesale 99.9% Pure Copper Balls Corrosion Resistant Solid Bearings Ball 3.5mm 3.969mm 4mm G100 G1000 - OPQ Chemical Co., Ltd