Bob Reeves Trumpet Mouthpiece Underparts contain the cup, bore, and shank. Each is designed to create a different sound, and is optimized for a different playing style. The standard #2 backbore works well with any cup.

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Bob Reeves Trumpet Mouthpiece Underpart Only Specifications:

• Standard #2 Backbore The second backbore made by Bob Reeves, it is similar to a Bach #10. It plays with excellent tone color and intonation
• B cup Deep cylindrical bowl similar to a Bach 7B
• C cup Medium-deep bowl similar to a Bach 3C
• D cup Medium-deep conical bowl
• ES cup Extra shallow bowl
• M cup Medium bowl
• S cup Shallow bowl
• SV cup Very shallow conical "V" shape
• V cup Very deep conical bowl