Popular student mouthpiece. Yamaha 4C Alto Clarinet Mouthpiece The Standard Series are made out of high-quality phenol resin (plastic) and feature a design based upon the top grade Custom Series. They are extremely consistent in specifications and playing quality, and offer excellent value for their price. The facing of this series is slightly shorter than that of the Custom Series making them easier to play, and easier for beginning students to achieve a rich characteristic saxophone sound. They also are available in a variety of sizes, to suit the needs players of many different styles.