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Parduba. Usually known only for the Harry James trumpet mouthpiece. Well, Akright makes a tuba mouthpiece. The basic specs are out there: cup diameter 32.61mm, the depth is 32.31mm. But after searching the internet I can't find anything about the throat diameter. I am hoping someone knows, or can measure it and post. I'm thinking it might be a good mouthpiece for either a large or dark tuba, or even a sousaphone outdoors. Thanks.

Is this is the "double cup" mouthpiece? In my opinion (worth as much as you paid for it, sure), it is just a novelty and is borderline unusable. I could maybe see it useful for "cranking"/HBCU style sousaphone playing, but that's about it. My lips bottomed out in it and it created some really odd sounds. But, to be fair, I was able to squeak out 4-ledger-lines-above-the-staff B-flats a little easier, so if you are encountering a lot of those in your repertoire it might be worth taking a look.