The Antoine Courtois AC420B Legend Series F-Attachment Trombone offers amazing performance and sound for the player looking for a symphonic trombone. The AC420B Legend features a .547" bore combined with an 8.5" one-piece bell that provides excellent projection and response. The traditional closed wrap F-Attachment features an adjustable thumb trigger for player comfort and mini ball linkage for smooth action. The Courtois AC420B 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.