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 "feels" a good bit smaller than the LM-10.5C because of the high point being further in and having a wider outer diameter. It still has a good size C cup and is not like our commercial line. It's a good mouthpiece for all around work for someone who just plays on a conventional shape mouthpiece with a smaller diameter. It shares the 27 hole and back-bore of the rest of our classical lineup.
12C: 0.6494 inner diameter measured at 0.030" 0.1440 throat 27 drill 1.0609 outer diameter