Produced using the most advanced computer design and manufacturing technology, our 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.There's a Yamaha mouthpiece to suit every player. CR-14C4L Rim I.D. - 16.88mm Throat - 3.65mm Rim designed for outstanding facility and flexibility. Popular in ensembles and bands. Can produce high volume.