Model PT 80 is designed players who prefer a wide cup when a clear but yet moderately dark sound is desired. Comfortable resistance with great projection in all registers. Recommended for F or Eb tubas.
Specs
Cup Diameter (mm): 31.5 (Deep, very round at bottom.)
Rim (mm): 8.5 (Cushion rim.)
Bore (mm): 8
Note on shanks
No indication: Large shank, for modern instruments with large receivers: (ø = 15.2 mm)
"S" models:  For intruments with small receivers: (ø = 14.8 mm)
Standard large European shank is recommended for most mouthpieces.
The Perantucci S shank is recommended for instruments that have smaller receivers or those which have high resistance
