Denis Wick 5880E SM5MU Euphonium Mouthpiece - Steven Mead Ultra Series, 39.30mm diameter, 25.75mm cup diameter, 6.30mm rim width, 7.40mm bore, V-type backbore, heavier outer shape, a slightly more rounded cup and a slightly sharper inner edge to the rim. The sound is powerful, with a beautiful singing high register, medium shank, silver plated.