The Model 1505 Bb rotary trumpet features a 5 1/2" diameter one piece bronze bell, giving it a big orchestral sound that's full and centered. The tapered .437" - .453" bore gives it stable intonation and even response throughout the full range of the trumpet. It has a dark, lyrical quality that is perfect for both exposed passages and for section playing. Three interchangeable mouthpipes offering various playing characteristics are included.