Schilke MOST 1M Trumpet, Mouthpiece for trumpet, Signature Series, Inner cup diameter: 17.43 mm, 24 backbore, Silver plated, Full and clear sound with excellent evenness over the entire tonal range and in every dynamic range, Equipped with a standard cup depth and the MOST-C Signature backbore, The mouthpiece rim was developed especially for Osamu Takahashi and Toshio Tanaka and lies in terms of contour and grip between rim shape #3 and the semi-flat rim shape #4, Comparable to MOST 1, but with a more powerful backbore