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I did a search and only found "For Sale" ads about this mouthpiece. I had one given to me and I know next to nothing about trombone/euph mouthpieces. The shank is too large to fit into the Yamaha YEP 321 euph I have at school. Any thoughts on these mouthpieces? Worth keeping? I could put a larger receiver on the 4 valve baritone I'm building if it would be worth it.

Thanks!

It's a very good pro mouthpiece. Similar to a Bach 4 cup in size, but more funnel shaped if I remember correctly. Definitely worth keeping if you need a good euphonium mouthpiece. Probably not a great fit for trombone. If you ever wanted to sell it I think it would go quickly on Dave Werden's forum.