Marcinkiewicz E3.1 J.W. Marcinkiewicz, Mouthpiece for Trumpet, JW Marcinkiewicz Signature model, Outer diameter: 27.46 mm, Inner diameter 17.12 mm, Cup depth: 10.92 mm, Bore: 3.56 mm, Total length 87.63 mm, Rim contour: Medium round, Silver-plated, Comparable to Bach 3E