The Bb marching trombone has features that include a 8 1/2"" (216mm) bell, a .500" (12.7mm) bore, a 19 1/4" (489mm) length, a weight of 4 lbs. (1.81kg), a 12C mouthpiece and a heavy-duty travel case. The instrument comes in lacquer or silver finish. The Bb Trombone has the convenience of 3 valves and is perfect for the marching ensemble providing a rich, resonant voice and easy handling.