Key: F-Bb Pitch: A445, with reversible 4th valve to "Bb-F" Bore: 11.89 mm (.468") Mouthpipes: Newly developed tapers #3 is .306 venturi #6 is .310 venturi Lever action: Noiseless string action, short stroke with stainless steel springs Valve rotors: Tapered hand-lapped brass with nickel silver outside casings Bearing plates: Tapered brass Material: Solid nickel silver Slides: Both inside and outside are hand-lapped nickel silver with rolled beads; short-length recessed slides for quick removal Bell: Large-throated hand-hammered specially annealed and tempered bronze, detachable, 12 1/4 " diameter Mouthpiece: Genuine Holton medium-deep cup Waterkey: On each mouthpipe for quick water removal Case: Ultra compact wood shell case with dual handles and brass hardware
