3mm -25mm dia. copper round bar rod milling welding metalworking t. & especially good rust resistance and easy processing. Copper Round Bar Rod Milling Welding Metalworking T. MaterialT2 copper Diameter 3mm Tensile strength (Rm / MPa) =295 Rockwell hardness (HRF) =65 Elongation (%) =3 WeightIncluding packaging50mm/6g, 100mm/8g, 150mm/12g, 200mm/16g, 250mm/20g, 300mm/24g, 400mm/60g, 500mm/76g, 600mm/88g.