Perantucci PT-84 Tuba Mouthpiece, cup diameter: 32,0 mm, bowl-shaped, medium depth cup, rim: 8,0 mm, well- rounded inner and outer edges, bore: 8,0 mm. Model PT-84 provides a clear sound. It is very flexible, has a good upper range, and gives a very quick response for a mouthpiece of this size, particularly in the low range. This is a very popular mouthpiece, recommended for Eb- and BBb tubas.