The Thomann EP 604-4 Euphonium is a wonderful intermediate instrument for an advanced player. It features 4 périnet valves. The body of this euphonium is made of copper that delivers excellent resonance and durability. The outer slides are made of nickel silver that makes it corrosion resistant. It also offers a rich and classy look. The lacquer finish protects the euphonium. The bell diameter of this instrument is 280mm. This instrument includes the mouthpiece and a light form fitting case with backpack straps and castors.