DEAR SIR,
  WE ARE THE MANUFACYTURER OF PRODUCING COPPER ROD.
  There are High conductivity copper casted steel earthing rods.these items are using special electroforming technology to apply 99.99% pure copper uniformly to distribute on steel core so as to make copper and steel core to combine perfectly for avoiding Oxygenation.Thichness of copper layer can be produced with 0.254mm.
  Diameter from 8mm to 25mm,
  Thickness of copper layer: 0. 3mm, 0. 5mm and 1. 0mm
  Our quality is very good ,and the error is 0.1mm,the level has arrived top-ranking in market.
  we have confidence in our quality.if you are really interested in it,we would like to send the sample to you.
  Hope we can have a good cooperation in the next future.