Trumpet mouthpiece - produced using the most advanced computer design and manufacturing technology. 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. A deeper cup than the 16C4. Soft tone. Mellow-but-solid sound that is ideal for orchestras. It has 17.14 mm rim inner diameter and 3.65 mm throat.