Bb Baritone. 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 .504" - .531" bore = 12.8 - 13.5mm, Yellow brass bell: Ø 8 3/8" = 211mm, Gold brass leadpipe, Nickel silver outer slides, 3 top-action valves, Stainless steel pistons, Clear lacquer finish, Original VINCENT BACH 12C mouthpiece and valvel oil, Light weight case with rucksack assembly.