The Stomvi 5510 Elite Series Eb/D Trumpet offers a balanced scale in all registers with excellent intonation. The 5510 Elite features a .450-inch bore with two tunable bells and two sets of slides for either key, Eb or D. This professional trumpet is for the soloist and orchestral trumpet player.Key: Eb / D Bore: .450-inch Leadpipe: #3 Standard Leadpipe Material: Yellow Brass Bell: 4.6-inch Interchangealbe #20 Taper Bells Bell Material: Yellow Brass Valves: Monel Piston 1st Valve Slide Adjustment: Thumb Saddle 3rd Valve Slide Adjustment: Fixed Ring Features: Interchangeable Bells and Slides in Eb and D Case: Yes Mouthpiece: Yes Finish: Silver