These pieces are made of a resin material but unlike most other mouthpieces in this price range, all interior surfaces as well as the facing are shaped and finished by hand, not the usual machining, so a much closer tolerance is maintained to insure superb consistency. These have a larger chamber for a full and rich tone. 

Marked 8 and tip opening measures .100.  This is a brand new mouthpiece.

SKU MTA03