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Large shank, heavyweight Stork tenor trombone pieces have deep V cups and lots of mass, suitable for orchestral use.
There are two options in the Custom Series line: Standard and Symphonic.
The Symphonic models have larger bores and back bores than the standard models do.
Additionally, the Symphonic models have chamfers added to the end of the shank. A chamfer is a small angled surface added onto the end of a shaft around the opening of a hole. Its purpose is to reduce the step between the end of the mouthpiece and the lead pipe which reduces the turbulence at the meeting point in effect elongating the back bore right into the lead pipe.
Relative: Bach 4G
Cup diameter: 1.027″ or 26.085 mm
The overall cup volume for this mouthpiece is closest to that of a Bach 4G, however the throat area is more opened making this more of a “V” shaped design. The “V” shape can add a hint of brightness to the tone. The rim is a bit wider than standard rims with a soft, rounded bite.
Relative: between Bach 4G and 5G
Cup diameter: 1.008″ or 25.6 mm
The same cup and rim shape as the #4, just with a slightly smaller inner diameter.
Relative: Bach 5G
Cup diameter: .997″ or 25.3 mm
The overall cup volume for this mouthpiece is closest to that of a Bach 5G, however the throat area is more opened making this more of a “V” shaped design. The “V” shape can add a hint of brightness to the tone. This rim has a bit of flatness to the top and is very rounded on the bite. It is known for its extreme level of comfort.
Relative: Bach 6 1/2AL
Cup diameter: .985″ or 25.019 mm
Same cup shape and rim as the #5 with a slightly smaller inner diameter.