Warburton Fraze signature trumpet mouthpiece top, silver plated. This top was designed for Mick Fraser of the Royal Australian Air Force Showband. The rim shape is reminiscent of the old Jet Tone Studio Model B and the extra shallow cup features a dropped undercut. This top would appeal to players who start off great with very shallow cups, but have trouble later on in the performance. Inside diameter .620" Outside diameter 1.090"