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Lee Stofer carries the Tilz mouthpieces http://tubameister.com/.

sbring wrote:IMHO, the Tilz-NEA M1 is almost identical to the standard UMI Conn Helleberg in rim feel and diameter, so if you look at how Tilz defines this rim, you know something. Inner and outer diameter are the same.

True about the rim feel & diameter, but the M1 (at least the one I've got) is shallower than the Conn. It plays with a brighter sound, and I used it for some solo recitals and whatnot.

The M1 is, overall, probably more like a Schilke Helleberg II.

sbring wrote:Interesting, my CH and M1 have exactly the same distance from rim to throat.

With the "thumb test" (admittedly unscientific), my thumb goes into the regular CH about 1/8" more than into the M1.

Maybe the shape at the bottom of the cup affects how far my thumb can go in there.

(yes, we are still talking about mouthpieces... )