Double French Horn 11D Symphony. 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-Bb/F-Tuning, reversible, 468" bore (11,89 mm), Yellow brass bell, CONN 7BW mouthpiece, Deluxe hard shell case, Lacquered finish, Large throated bell, 12" = 305 mm.