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. Rim designed for outstanding facility and flexibility. For rotary trumpets. Between the 14E4 and 16E4 in size. It has 16.92 mm rim inner diameter and 3.88 mm throat.