The Antoine Courtois AC420BO Legend Series F-Attachment Trombone offers amazing performance and sound for the player looking for a symphonic trombone. The AC420BO Legend features a .547" bore combined with an 8.5" one piece bell that provides excellent projection and response. The open wrap F-Attachment features a free-blowing design plus an adjustable thumb trigger for player comfort and mini ball linkage for smooth action. The Courtois AC420BO Legend F-Attachment trombone includes a lightweight contoured case and mouthpiece and is available in lacquer finish with a choice of yellow or rose brass bell.