Bearing Silicon Nitride Si3n4 Zirconia Bead Zro2 Ceramic Balls for Ball Mill Machine Zibo Roshine Ceramic Technology Co., Ltd. Base Info Description Pre：High Speed Low Noise Miniature Ball Bearing W 638/2-2z for Micromotor Next：Precision Polishing Industrial Zirconia Ball Ceramic White Zro2 Bearing Ball 5.556 mm
