Bach Commercial Series Shallow Cup Trumpet Mouthpiece in Silver 3S Commercial Series Shallow Cup Trumpet Mouthpiece in Silver 3S Bach Commercial mouthpieces are designed for everyone from the aspiring lead trumpet player to the seasoned veteran who is looking for something new Available in two cup designsshallow cup or modified V cup, these mouthpieces provide the flexibility needed to get the right feel for you All models come designed with a #27 ( 144) throat, and a modified comfort rim with a flatter top