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Zys Si3n4 Ceramic Balls 10 10.318 11.1125 11.509 11.906 12 12.303 12.7 mm Silicon Nitride G5 Precision Ball, Find Details and Price about Ceramic Ball Steel Ball from Zys Si3n4 Ceramic Balls 10 10.318 11.1125 11.509 11.906 12 12.303 12.7 mm Silicon Nitride G5 Precision Ball - Luoyang Bearing Research Institute Co., Ltd.