There was no compromising on the design of the Holton Admiral trumpet, only on its price. In fact, this horn is often mistaken for a professional model because of its responsive, easy blowing characteristics and its large, full tone and great projection. Holton believes that the student should receive the same quality, control and playing ease as a professional, but at a student price.Key of Bb. 4.8125" bell, .459" bore, 1st slide U-hook, adjustable 3rd valve slide stop-nut, Monel valves, clear baked epoxy lacquer finish.