The MR-350VG Gold Promasters are a limited production version of the Promaster Valved. Gold Promaster features a C.N.C. machined billet alloy comb, the ultimate in precision air tightness and lasting quality. The Phosphor Bronze interchangeable reeds are built using our new computer controlled laser cutting system, producing unheard of tone and sound projection. Plated in 18 karat gold with satin black anodized combs, and includes a soft lined ergonomic carrying case. Key of "C"