Key: F-Bb Pitch: A445 with independent Bb tuning Bore: 11.89 mm (.468") Mouthpipe: .310 venturi of nickel silver Lever action: Noiseless string action, short stroke with stainless steel springs Valve rotors: Tapered hand-lapped brass Branches, bows and ferrules: Nickel silver Slides: Solid nickel silver Bell: 12.25" diameter medium-throated hand- hammered nickel silver Waterkey: On mouthpipe Options: Extra-long main and Bb tuning slides, detachable bell and flat case available as model H277