Copper bonded earth rods probably offer to the installer the best and most economical earth rods available . They are made by molecularly bonding 99.9% pure electrolytic copper on to a low carbon steel core.
Copper thickness standard 250 microns.(others plating copper thickness as your requested)
Earth rods to BS EN 50164-2, Bs7430 and Ul467 ,Fittings to BS EN 50164-1