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Zys Si3n4 Ceramic Ball Diameter 0.8 1 1.2 1.5 1.588 2 2.381 2.5 mm Silicon Nitride Ceramic Bearing Balls G5, Find Details and Price about Ceramic Ball Steel Ball from Zys Si3n4 Ceramic Ball Diameter 0.8 1 1.2 1.5 1.588 2 2.381 2.5 mm Silicon Nitride Ceramic Bearing Balls G5 - Luoyang Bearing Research Institute Co., Ltd.