CCS wire is formed through electroplating method (taking steel wire as the core and depositing the copper layer evenly on the surface of the steel core) and cladding method (Cladding planished copper stripe concentrically on the outer surface of the steel core). CCS wire can be divided into six types by conductivity, 15%CCS, 18%CCS, 21%CCS, 25%CCS, 30%CCS, 40%CCS and two mechanical status: Annealed (A) and Hard drawn(H).