Key Bb. Bore .580 .650 inch graduated. Bell 12 inch. Bell Material Yellow Brass. Bell Position Upright. Valves Stainless Steel. Number of Valves 4. Valve Position 3 Top and 1 Side. System Compensating. Features Main Tuning Slide Trigger with Quick Release System; Heavier Mouthpiece Receiver; Heavier Bottom Valve Caps. Case Yes. Mouthpiece Yes. Mouthpiece Shank Large. Finish Lacquer, Silver.