This is the Miraphone M5050 "Ambassador" fully compensating professional Bb euphonium. 3 + 1 piston valves. Yellow brass construction with gold brass leadpipe. This has a heavy weight mouthpiece receiver, vented piston valves, and a new ergonomically designed 4th valve. Includes plastic molded case and BT16 mouthpiece.
Bell: 12.2" (310mm)
Bore: 0.610" - 0.638" (15.5mm - 16.2mm)