The Antoine Courtois AC420MBH Legend Series Hagmann F-Attachment Trombone offers amazing performance and sound for the player looking for a symphonic trombone. The AC420MBH Legend features a .547-inch bore combined with an 8.5-inch one piece bell that provides excellent projection and response. The AC420MBH also features a Sterling silver leadpipe for an increased tonal core and response. The open wrap F-Attachment with the Rene Hagmann valve features a responsive, free-blowing design plus an adjustable thumb trigger for player comfort and mini ball linkage for smooth action. The Courtois AC420MBO 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.