The Jewel Concert Series Alto Sax Mouthpiece is an exceptional mouthpiece made from 100% pure hard rubber. It is very versatile and suites the needs of professional players called upon to do a variety of work such as shows, recordings, classical or light commercial work. Each Concert mouthpiece is hand finished at the walls, tip rails, and chamber for exact measurements and playing response. The Concert Alto with it's wonderful classical sound, is a great choice for concert or symphonic band.