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. Superb clarity for large ensembles and orchestras. Well-matched to C trumpets. Powerful sound. It has 16.63 mm rim inner diameter and 3.65 mm throat.