I make saxophone mouthpieces in nickel silver, brass, some in pure bronze - basically high tin and copper. [JRB Interview 1996]
Bell Metal I also make a tenor mouthpiece in bell metal. Pure bell metal. It's extremely hard, but if you dropped it on a hard surface it would break, crack like a pot. It's similar to bronze, but contains more tin. Proper bell metal has 20% tin, 80% copper. Very similar to what Zildjian make their cymbals out of. [JRB Interview 1996]
Nickel Silver The base metal isn't brass, like most people use. I just use the best materials available. I use nickel silver, which is one of the most noble alloys you can get, 50% dearer than brass. [JRB Interview 1996]
Stainless Steel He [Geoff Lawton] is using very high quality stainless steel, and the mouthpieces are machined from the solid bar. Very tough on the cutting tools … needs a new cutter about every fifty mouthpieces. But by working from the solid bar, it does give a finer grain, far less flaws, and far less porosity, which means no pitting from acid saliva. Virtually a “for ever” mouthpiece [Crescendo 1988]
Surgical Stainless Steel Unless you were an absolute fanatic, and you'd done twenty years in a tool room, you wouldn't know how to start with stainless steel. Brass is like a boy's material. The big advantage, if you like stainless steel, is that it will last for ever. It will never need replating. It will never wear. You could drop it on the floor and you'd be very unlucky if it dents. [JRB Interview 1996]
Ebonite does give a different sound, a more woody sound. Even if you go to a high baffle, you still get a more woody sound. And it's very comfortable in your mouth; you've not got this problem of a cold mouthpiece. Although it's quite rigid, it feels quite rigid in your mouth. [JRB Interview 1996]