Key: FSize: 6/4Bore: .748-inch Primary; .787-inch 4th Valve and .807-inch 5th ValveBell: 17.3-inchBell Material: Yellow BrassBell Position: UprightNumber of Valves: 5Valve Position: FrontValve Type: 4 Piston and One RotaryValve Material: Stainless Steel Pistons and Brass RotaryFeatures: 5th Thumb Activated Rotary Valve; Open Design for Improved Low RegisterCase: NOMouthpiece: YesFinish: Lacquer, Silver