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 5B has the same rim as my 5Z (Severinsen model). It is loosely based on an early Elkhart Bach 6B. Many players playing a mouthpiece of this size switch back and forth between a small mouthpiece and a bigger one, so this piece was designed with them in mind. The cup is a little deeper than the 1 1/2 and the 3. It also has the same back-bore and hole size as the 1 1/2 and the 3 so it retains similar characteristics, but with a slightly more compact darker sound.
5B: 0.6521 inner diameter measured at 0.030" 0.1440 throat 27 drill 1.0603 outer diameter