This is a large CC/BBb tuba mouthpiece. This mouthpiece is designed as a solo counterpart to the Bayamo. Ideal for those who like a larger rim diameter, with and intense focused sound. Designed to enhance the upper overtones that will project to the back of the hall. The Caver is by no means a small mouthpiece, and is a very good choice for tuba players who are searching for clarity without sacrificing a thick resonant tone. Rim is 1.32 and the throat is .320 in diameter, medium funnel shape cup.