Steel Ball, Aluminium Balls manufacturer / supplier in China, offering High Precision Chrome Steel Ball G10 Z4 Premium Quality 20mm, Copper Bronze Brass Ball Usage for Electrical Appliances and Switches, Carburetors, Valves, Precision Steel Ball 0.3mm 0.5mm 0.7mm 0.8mm 1.0mm Bearing Ball Z4 and so on.