Smooth, Precise Symphonic Trumpet Mouthpiece The Symphonic Series of trumpet mouthpieces from Bach feature a wide variety of throat, backbore, and cup alteration combinations. Bachs craftsmen used CNC machines to bore out their Classic Series cup layouts to widen the throat and backbore, eliminating the tonal inconsistencies that arise from a traditional hand-reaming process. The resulting precision-cut Symphonic Series mouthpiece functions smoothly, accurately, and reliably throughout every performance. Bach offers three different cups, each with a 24 backbore, and the choice of four separate throat sizes, ranging from 22 to 26. Ideally suited for classical, symphonic performances, this is the mouthpiece you can trust when its time to hit the stage! Note: GearNuts offers a variety of Bach Symphonic Series Trumpet Mouthpieces. Contact your Sales Engineer today and find out which one is the right fit for your trumpet and playing style.Bach Symphonic Series Trumpet Mouthpiece Features: The perfect choice