Copper-clad steel wire (CCS), also known as copper-coated steel or the registered trademark Copper weld, is a bimetallic product primarily used in the cable industry. This wire utilizes a steel core for strength while the copper layer provides electrical conductivity and corrosion resistance. It is suitable for applications such as grounding wires, communication cables, and guy wires—scenarios requiring both strength and durability alongside theft resistance (due to low scrap value) and high-frequency performance (skin effect). It perfectly combines the mechanical toughness of steel with the electrical properties of copper. Usually copper clad steel wire can reach 30% and 40% IACS conductivity. Common sizes are available in 1, 3, 7 and 19 strand cables.