Thank you for viewing. This is the Euphonium AMUSE by Project Euphonium. - Model: AME-502Ⅱ - Instrument Type: Euphonium - Color: Black & Gold Lacquer Finish - Material: Metal (Yellow Brass) - Pistons: 4 Valves - Tuning Slide Trigger - Interchangeable Mouthpiece Receiver - Water Key - Non-Compensating - Semi-Hard Case (with Casters) The mouthpiece will be a Silky 51D. This instrument is light due to the non-compensating system, making it easy to produce sound, and I think it has a good resonance for the price. There is some slight plating wear on the tip of the 3rd valve slide, but it is hardly noticeable. The mouthpiece used here is a large shank. Above all, it looks cool! It is made of metal (yellow brass), not plastic. I think it can be used in concerts. The black AMUSE is a rare instrument. How about it as a playful sub-instrument or a main instrument?