The Yamaha 14B4 Trumpet Mouthpiece hasx been designed with a relatively large rim diameter and shallow cup giving it outstanding overall balance for all musical genres. Produced using the most advanced computer design and manufacturing technology, Yamaha's Trumpet 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 many configurations. There's a Yamaha mouthpiece to suit every player.