Bb Euphonium. Conn Instruments standing for high quality american made brass instruments. The history shows the long periode of making experiences and getting better. But the main effort based on passion and love for music. Play and you will hear it. Features Dual bore .570'' / .660'' = 14,5 / 16,8 mm, Yellow brass bell Ø 11" = 280mm, Gold brass leadpipe, Nickel silver outer slides, 4 top-action valves Inline, Stainless steel pistons, Clear lacquer finish, Original VINCENT BACH 6 1/2AL mouthpiece and valve oil, Light weight case with rucksack assembly.