Copper bonded earthing rod from Pioneer Power International have a 99.9 percent pure electrolytic copper layer molecularly attached to a high-tensile, low-carbon steel core. This hybrid design combines copper's superior electrical conductivity and corrosion resistance with steel's mechanical strength, which enables deep installation either power-driven or manual. Benzotriazole derivat... https://www.pioneerpowers.com/copper-bonded-earth-rod.php