Key: Bb / FBore: .543-inchBell: 9-1/2-inchBell Material: Yellow BrassBell Position: UprightValves: Stainless Steel PistonNumber of Valves: 4Valve Position: Traditional (3 Top + 1 Side)System: CompensatingFeatures: Compensating Valve Design; Bottom Sprung Stainless Steel ValvesCase: YesMouthpiece: YesMouthpiece Shank: SmallFinish: Lacquer, Silver