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.