Atelier Tsubasa Trumpet mouthpiece 1-1/4C. Mt. Vernon Bach rim and cup, backbore copy mouthpiece. Throat 26 Please check the condition in the photos. There are shank marks, but it is generally clean. No box. Thank you. Quoting from the manufacturer: Mr. Kameyama's Mount Vernon rim and cup, loved by professional and amateur players around the world, was drawn using a super-precision contour measuring instrument to the micron level, and then cut with a CNC precision lathe. ・Backbore The shape of the backbore of an individual that allows for a clear sense of pitch and intonation, and can be played naturally. Selling due to size change. Please refrain from purchasing if you are sensitive to used items.