Electroplating Steel Ball Size: 0.3mm~25mmGrade: G10~G1000Hardness: HRC 58-65Material: Carbon Steel, Chrome Steel, Stainless Steel, Copper, Aluminum and so on.Hardness: HRC 58-65Type: Gold plating, silver plating, zinc plating, nickel plating, chrome plating, copper plating. Standard: GB, ASTM, DIN, JIS Diameter, hardeness, material, plating or other specifications can be designed according to your demand.