Key: BBbSize: 4/4Bore: .748-inchBell: 17.75-inchBell Material: Yellow BrassBell Position: UprightNumber of Valves: 4Valve Position: FrontValve Type: RotaryValve Material: BrassFeatures: 3B Ball Bearing Linkages on Both Ends of the Valve Connecting ArmCase: N/AMouthpiece: N/AFinish: Lacquer