The difference of the 3 glass surfaces are sorted by the clear sharpness of the calls sound. Bronze glass, Crystal, Plain glass, the Bronze glass has the clearest/sharpest sound of the 3, Crystal has the better volume of the 3. All 3 play just fine, but that's the biggest difference between them, blasted glass is a whole nother story, it has a flatter sound to it, not as clear as a non-blasted glass does. In aluminums the anodized has the sharpest/cleaner sound to it, the plain alum. had a bit deeper sound to it, and the blasted alum. has about the same sound to it, but is easier to play.