A massively heavy hammer, ideal for use on vehicles when trying to separate ball joints, and the like, when a big heavy blow is required. Not for the feint hearted, however, it takes a bit of handling due to it's weight, but just the job!
I got my hammer very cheap (around 1/2 the price of the RRP) so it was an amazing bargain. It feels top quality and I expect will last a very long time. I did not see any other 4lb copper hammers on the market, but found this one to be exactly what I was after.