Good catch Bob, I should have included that in the survey. I am getting ready to make a couple of sets of soft jaws. Looking at the different prices of Brass vs. Copper vs. Aluminum vs. bronze, I see why everyone is using Aluminum. Mild steel is also an option. Right now, I am leaning towards brass, but that might change. In any case, I think a set of mild steel jaws is in the making as well.