Furse copperbond 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 onto a low carbon steel core. 
Furse rods are not of the sheathed type. They are highly resistant to corrosion, and because the steel used has a very high tensile strength, they can be driven by power hammers to great depths. 
The counter-bored couplings are made from high copper content alloy – commercial brass is not used.
Connections to the rods can be by mechanical clamps, compression or by FurseWELD exothermic welding System.