The Eastman ETB829 Professional Series F-Attachment Trombone is tuned to the key of Bb and is ideal for professional players. This professional F-attachment trombone features a .547” large bore, an 8.5" two-piece brass bell, an open wrap with axial valve in F and three interchangeable leadpipes. Along with a yellow brass handslide with a nickel crook, the trombone also includes a mouthpiece and protective case.