Features Key: Eb / D Bore: .453-inch Leadpipe: Standard Leadpipe Material: Yellow Brass Bell: 4.8-inch Interchangeable Tuning Bells - One in Eb and One in D Bell Material: Yellow Brass Valves: Monel Piston 1st Valve Slide Adjustment: Fixed Ring 3rd Valve Slide Adjustment: Fixed Ring Features: Two Complete Sets of Slides (Eb and D); Two Tuning Bells Case: No Mouthpiece: No Finish: Lacquer, Silver Description Product Description The 1523 features two 4.8-inch interchangable Eb and D tuning bells designed to produce a powerful, dark symphonic sound. The 1523 also includes two sets of slides, one set in Eb and one set in D.