Robert Tucci Sousapower 4 Tuba/Sousaphone Mouthpiece bell cover The major difference is that

The major difference is that the heavy shell model ensures that the sound does not dissipate in the extreme loud dynamics

8 for 3/4 and 4/4 BBb and CC tubas

with the mouthpiece removed

with clearly defined edge

Robert Tucci Sousapower 4 Tuba/Sousaphone Mouthpiece bell cover The major difference is thatRobert Tucci Sousapower mouthpieces are for strong players that desire exceptional projection and strength in the middle and low register. The rim design and proven cup characteristics combine to create a high level of efficiency. Specifications: Cup Diameter: 32mm 1. 26in, medium depth, pear shaped Rim: Width, 8mm 0. 31in, slightly rounded inner edge Bore: 8. 4mm 0. 33in Proposition 65 Warning Link