I only use brass because it sounds so good. It is so resonant. Guess that is why they make bells with it. Most high quality trems and bridges are made of steel. They are not made of brass because it is so expensive.
Steel is dirt cheap.
You can quickly see why nobody seems to use it. Just like everything on a Driskill Guitar, I use only the best no matter the cost. Here is one of the trems being cut. It takes forever and tons of tools. I had to make twelve different sets of jaws just for the vise.