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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The 5.3C has the same rim as my 5Z (Severinsen model). It has a 27 hole, and the standard classical back-bore. The major difference of my 5.3C model and other manufacturers, is that I incorporate the 3C cup in my 5.3C, giving it 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.
5.3C: 0.6521 inner diameter measured at 0.030" 0.1440 throat 27 drill 1.0603 outer diameter