The three materials available are brass, nickel silver (German silver) and for that extra special set, sterling silver.
The surface of the brass plates have a satin finish. Nickel silver can be satin or with a full polish. Sterling silver usually always has a full polish. We use Argentium sterling silver which has a higher silver content and never loses its shine even if the surface lacquer is removed. Nickel silver will never tarnish and brass plates and polished parts are coated with hard nano-ceramic clear coating. Coloured engraving is another option.