Key: BbBore: .640-.680-inch Graduated BoreBell: 12.25-inchBell Material: Yellow BrassBell Position: UprightValves: Stainless Steel PistonNumber of Valves: 4Valve Position: Traditional 3 Top + 1 SideSystem: CompensatingFeatures: Compensating Valve Design; Valve Spring Silencer SystemCase: YesMouthpiece: YesMouthpiece Shank: LargeFinish: Silver