The Vacchiano #2 Traditional Cornet Mouthpiece
Inner diameter = .669" or 17mm.

These models offer the sound quality sought by serious brass band players, yet greater versatility in range and response than other popular traditional cornet mouthpieces. All models are available with in either the standard shank or the shorter, traditional cornet style shank.

The Bore Size of the "SC" cup measures .154"or 3.911mm
The Back Bore is the Symphonic "D"
The Cup Depth measures .675" or 17.145 mm

The Bore Size of the "A" cup measures .161" or 4.089mm
The Back Bore is the Symphonic "D"
The Cup Depth measures .900" or 22.860 mm

The Bore Size of the "A+" cup measures .169" or 4.292mm
The Back Bore is the Symphonic "D"
The Cup Depth measures.940" or 23.977 mm

For more information on these models, please visit our web site here: http://storkcustom.com/Vacc%20Cornet%20specs%20new.htm