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I recently purchased a few tubas for resell and was looking to purchase some cheap mouthpieces so I checked eBay. I found something interesting. One seller has tuba mouthpieces for sell but you'd never know it from the listing. When you look through the pictures he includes engineering drawing of the outside of the mouthpiece. At least I know EXACTLY what I am getting; except he doesn't include the dimension of the inside of the mouthpieces.

http://www.ebay.com/itm/272753631064" target="_blank

That attempt at an English translation broke my brain.

Yes, and this auction you get 5 of them, so that equals $13 a piece.

The Chinese mouthpieces I've bought have been similar to a 24 aw. The plating does not wear well but they are good for what they are.