Bb/F/D Bass trombone 62H 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 F/Bb/D-Tuning, Dual rotor, dependent system, offset, 562" bore = 14,27 mm, Bell Ø 9 1/2" = 229 mm, 3 interchangeable leadpipes, CONN 1 1/2G mouthpiece, Deluxe wood shell case, Lacquered finish, Bb/F/Gb/D-tuning, Dual rotor, independent inline system, Patented CL2000 rotor system