Standard Series 6B4 Cornet Mouthpiece With Long Shank From Yamaha, Model Number Produced using the most advanced computer design and manufacturing technology, our Standard Series mouthpieces feature unmatched precision, smooth attack, secure control, and easy playability. They have the ideal weight for all-around usage and are available in over 100 configurations. There?s a Yamaha mouthpiece to suit every player. 15.65 inner rim diameter Semi-shallow cup with semi-flat rim contour Suitable for playing high notes Works for all genres Long shank