The mission of Patrick Mouthpieces is to provide trumpet players the tools necessary to perform on their instruments what they hear in their head, and to enable us all to switch between musical genres and not compromise sound or performance.
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This mouthpiece uses the 12 rim with the cup shape of our 3C, giving the 12.3C more body and the actual cup more overall volume for a big round sound. You still retain the benefit of the smaller rim size, but without giving up the sound of the bigger mouthpiece. It shares the 27 hole and back-bore of the rest of our classical lineup.
12.3C: 0.6494 inner diameter measured at 0.030" 0.1440 throat 27 drill 1.0609 outer diameter