Bb/F/Gb/D Bass trombone 112H from the Proffesional series. C.G. 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 Bb/F/Gb/D-tuning, Dual rotor, independent inline system, 562" bore = 14,27 mm, Bell 10'' = 254 mm, Gold brass bell, Hand-hammered one-piece bell, Lightweight slide, CONN 1 1/2G mouthpiece, Deluxe wood shell case, Lacquered finish.