Copper bonded earth rods are made from two main materials: a strong, low-carbon steel core and a thick outer layer of 99.9% pure electrolytic copper. The steel core, often crafted from SAE 1018 grade or something similar, gives the rod its strength and durability, allowing it to be driven into the ground without bending or breaking. The copper layer is bonded to the steel surface t... https://www.pioneerpowers.com/copper-bonded-earth-rod.php