Storm's copper clad rods have a heavy, uniform coating of copper bonded to a rigid steel core. UL Listed rods have 10-mil minimum copper plating. UL/RUS models have 13-mil minimum of copper.
The main advantages of copper clad steel, trade-nammed "Copperweld" are better corrosion resistance, higher strength, lower electrical resistance and impedance and theft prevention. Because the process of cladding or bonding process makes copper recovery next to impossible to recycle.