Key: Bb / F Bore: .504-inch Bell: 8-3/8-inch Bell Material: Yellow Brass Bell Position: Upright Valves: Monel Piston Number of Valves: 4 Valve Position: Traditional (3 Top + 1 Side) System: Compensating Features: Compensating Valve System; Gold Brass Leadpipe and Valve Casings Case: YAC BHC-61 Plastic Shell Case Mouthpiece: Yamaha 45C2-12C Mouthpiece Shank: Small Finish: Silver