Designed for use by top orchestral professionals, Manufactured and designed to the highest quality standards with the combined input of John Hagstrom of the Chicago Symphony Orchestra and Yamaha Brass Designer Bob Malone. Key of C. .462" bore, 4-7/8" bell with variable thickness and a French bead rim, yellow brass mouthpipe with "hidden" reversed design, yellow brass body, extended water key chimney, 3rd valve stop that allows full extension of slide, silver-plated finish. Variable bell thickness the bell thins as it flares outcombined with a sideseam design helps the player produce a full, rich sound French bead rim with low dome wire for improved overall projection Malone MC1 "hidden" reverse pipe design for superb intonation and even tone through instruments range Extended water key chimney improves resistance and overall tone Third valve stop mounted to allow full extension of slide Narrow brace set, reminiscent of '30s designs, to give the instrument quicker response Minimally invasive engraving adds attractiveness without effecting temper of the bell