Key: BbBore: .580-.610-inch Dual BoreBell: 12-inch Two-PieceBell Material: Yellow BrassValves: Monel PistonNumber of Valves: 4Valve Position: Traditional 3 Top + 1 SideSystem: CompensatingFeatures: Compensating Valve System; Monel Valves with Metal Valve Guides; Traditional Valve Position (3 Top + 1 Side)Case: YesMouthpiece: YesMouthpiece Shank: LargeFinish: Lacquer, Silver