Used Bob Reeves Dynamic Mass 40/ES DMM Trumpet Mouthpiece Backbore and Cup with Original Box

Used Used Bob Reeves 40/ES DMM Trumpet Mouthpiece Cup and Backbore. The mouthpiece has “40ES” engraved on the backbore, as well as Dynamic Mass. The cup has a screw on rim. This one was made in the USA. In good cosmetic condition. Just chemically cleaned. It comes in its original box.

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