Patrick Mouthpieces - Commercial Trumpet Backbore CM-27
Patrick Commercial Trumpet Backbore CM27. This is the standard backbore for Steve Patrick's commercial mouthpiece line, with a #27 throat.
FROM STEVE PATRICK:
This back-bore is on all of our commercial back-bores. It has a 27 hole, and has a very straight taper. While not "tight" it is the most focused and smallest of our tapers and matched up great to the smaller pieces so that you don't "fall in" to the mouthpiece.
For more info, check the Patrick Mouthpieces size comparison chart here:
https://patrickmouthpieces.com/comparison-chart/