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 good combination of large rim and relatively shallow cup. Powerful sound. A good choice for orchestra first-chair players. It has 17.3 mm rim inner diameter and 3.65 mm throat.