Copper clad steel wire (CCS) is a type of wire that consists of a steel core and a copper coating. It is commonly used in coaxial cables to provide strength and conductivity. The steel core provides strength and the copper coating provides conductivity. The copper coating is typically a thin layer of copper that is electroplated onto the steel core. This type of wire is often used in applications where high strength and good conductivity are required, such as in communication and power cables.