Rousseau ER20014R Classic Alto Sax Mouthpiece 4R Eugene Rousseau established himself as a leading saxophonist and developed an acclaimed line of mouthpieces. His designs are unique and practical-a balancing of baffles, side walls, and facings-and are manufactured of highest quality rubber. Available in Soprano, Alto, Tenor, and Baritone Wide Range of Tip openings per model.