Modern or antique, to follow your needs
Yellow brass, red brass, gold brass, copper, aluminum, phosphor bronze, nickel, delrin and even Buffalo Horns!
We really have a wide selection of materials to start from. Some are pretty common and we know how they behave. Some others are pretty exotics and can offer both an increase in performance or a drastic change in tone quality.
Two good examples are phosphor bronze and buffalo horn. The first is tough to machine but give a very vibrant and resonant tone, the second is incredibly light, lively and super fast responding. Many choose it for when it's cold outside but end up keeping it in warm temperatures because it feels so nice on the lips and increases your stamina!