Perantucci PT-72 tuba mouthpiece, cup diameter: 32,5 mm, moderately rounded st bottom, rim: 8,0 mm, fairly sharp inner edge, moderately round rim, bore: 8,1 mm. Model PT-72 is a large mouthpiece for the F or Eb tuba. The sound has considerable weight combined with the richness and clarity associated with the German concept. It is also recommended for intermediate level students of the BBb and CC tubas, gold plated