... Steel Ball, Stainless Steel Ball, Carbon Steel Ball, Ceramic Ball, Copper Ball Chrome steel ball, stainless steel ball, carbon steel ball, ceramic ball, copper ball, aluminum ball, chromate steel ball, plating steel ball, hollow steel ball Specifications:1)strong anti-wear resistance2)bearing ball ... High - speed, low noise special bearing 4. Ball valves for liquid and gas etc.8)there are below sizes ...