Denis Wick 5880E Euphonium SM5U, Mouthpiece for Euphonium, Steven Mead Ultra Series, Diameter: 39.30 mm, Cup diameter: 25.75 mm, Rim: 6.30 mm, Bore: 7.40 mm, Backbore: V-type, Heavier outer shape, Slightly more rounded cup and sharper inner rim to the edge, Large shank, Finish: Silver-plated