SOUND PROPERTIES: The clarinet sound is produced by the vibrations of the reed attached to the mouthpiece as the air moves across it. The hardness of the reed and the physical characteristics of the mouthpiece all are contributing factors to the quality sound produced. The wood used is typically Grenadilla but Rosewood has also been used. The less expensive models are often made with plastic or composite. These will not crack with changes in humidity and temperature as the wooden models, but they lack the character of sound of the wooden models.