Model PT-65, Perantucci Best-Seller Eb tuba

Cup Diameter :  32,0 mm. Medium depth, strongly round.
Rim  :  8,5 mm. Rounded with well defined inner contact point.
Bore :  7,8 mm
 
Model PT-65 provides a strong center and great accuracy in all ranges just as the PT-64, but with greater dynamic range. The sound is clear and dominating yet dark in character. It is an excellent mouthpiece for orchestral performance.

Perantucci tuba mouthpieces are available with the following 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 sounding.