This CM331 mouthpiece is the professional standard for the Alto Clarinet. Its deep timbre and ease of blowing makes it a mouthpiece that is designed for the experienced performer who craves a great sound. Traditional Style The beak on the CM331 Mouthpiece is of a traditional design meaning that the taper of the mouthpiece happens closer to the edge of the mouthpiece and at a greater angle. This has been a tried and tested method of mouthpiece design for many years and is a popular style chosen by many of the great artists. 5RV Design The professional design of the 5RV Mouthpiece makes it a desired purchase for the discerning performer. The tone produced is comparatively very deep and rich. It is also very easy to blow making it good for endurance performing. The mouthpiece has been designed for use with 3 – 4 scale reeds to give the best possible tone. For more information on Vandoren Clarinet Mouthpieces please find the PDF below. Cant find that specific mouthpiece online? Please contact us for more information. Features/Specifications Tip Opening: 1.26mm Facing Length: Medium Suitable For: Alto Clarinet Recommended Reed Strength: 3 → 4