Product Name: Copper Alloy Round Bar / Round Rod
Standard: ASTM B151
Material Grades:
ASTM B151 UNS C70600, 90% Copper, 10% Nickel (Cu-Ni 90/10)
ASTM B151 UNS C71500, 70% Copper, 30% Nickel (Cu-Ni 70/30)
Size: 20 mm, 50 mm, 90 mm, 120 mm, or as per client's requirements
Length: 3 M / 6 M, or as per client's requirements

Source: https://www.landee.cn/copper-alloy-round-bars-b151-uns-c70600-c71500-20-120-mm.html