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 clarinet sound.The 5C facilitates a richer, fuller volume than 4C, with greater tonal variety.