A custom mouthpiece from the US. Very comfortable symphonic mouthpiece. A combination V and C cup to give the projection of a V with the warmth and resistence of a C cup. Inspired by the designs and mouthpieces of Bill Vacchiano. Full spec and info can be found at www.storkcustom.com. A nice bright sound with a warm tone. Smaller diameters are excellent in Eb Trumpets. B CUP - The standard back bore is taken from Vacchiano's own signature mouthpiece. The profile is slightly tighter behind the bore and flares just a bit more at the end of the shank than a standard Bach back bore. C CUP - The "C" back bore offers a step between the average standard back bore and what most players have come to know as a Symphonic or #24 back bore. D CUP - This is our version of the Symphonic cup. This is a good size for larger mouthpiece lovers. (the 3D 26C mouthpiece is popular choice for orchestral players)