Galvan’s copper coated rods have a heavy, uniform coating of copper metallurgically bonded to a rigid steel core. Color-coded to reduce errors. UL Listed rods have 10-mil minimum (254 microns) copper plating. UL/RUS models have 13-mil minimum of copper but 10-mil coating is acceptable. Listed to UL-467 specification. Galvan manufactures copper-coated rods under patent 6,527,934.