... 15% , weight CU 40% , we produce the aluminum wire , copper clad aluminu wire, copper clad steel wire for many year .yes ,the cca and ccs ... .cca technology : elongation :> 15% , strenght > 220mpa . volume Cu 12% , , volume STEEL 88% , specific density : 7.95% conductivity : 18 %IACS DC RESISTANCE ... BENDING PROPERTY : >4 TIMES 360 DEGREE BENDING PROPERTY : >4 TIMES Copper Clad aluminum Wire