1.China steel ball leading manufacturer for 13 years 2.High ... production of precision steel balls, carbon steel ball ,stainless steel ball and bearing steel ball , for 13 years in China, ... of the production, and the production out of the ball 100% error to ± 1 silk, absolutely guarantee the ... home and abroad quality casters, bicycle, force of car ball.4. Pressure, wear-resisting, the noise is smallMany ...