This is a very large CC/BBb tuba mouthpiece designed for a huge sound output. For tuba players that are looking for an enormous sound that will support even the largest ensemble. The Bayamo is similar to a PT-88 rim diameter, with a deeper funnel cup and larger throat. A huge mouthpiece that is balanced, and still plays very well in tune with great articulation, and a thick rich tone. Ideal for those low excerpts that need a huge amount of volume! Rim 1.32, and the throat is .332 in diameter, very deep funnel shape cup.