5C Bb clarinet mouthpiece from Standard series that is made out of high quality phenol resin (plastic) and features a design based upon the top grade Custom series. It facilitates a richer, fuller volume than 4C mouthpiece, with a greater tonal variety. The facing of the mouthpiece is slightly shorter than that of the Custom series making it easier to play, and easier for beginning students to achieve a rich characteristic sound. Tip opening: 1.1 mm.