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Pure 99.999% 0.5mm 1.0mm 1.5mm 2mm Good Heat Dissipation Computer Motherboard Bearing Balls for Grinding Ball Bearing Industries, Find Details and Price about Bearing Ball 0.5mm Micro Bearing Steel Ball from Pure 99.999% 0.5mm 1.0mm 1.5mm 2mm Good Heat Dissipation Computer Motherboard Bearing Balls for Grinding Ball Bearing Industries - OPQ Chemical Co., Ltd