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.

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Bob Reeves Trumpet Mouthpiece Underpart Only Specifications:

• 692sL Backbore Shorter than a conventional mouthpiece that is very efficient for playing in the upper register. When added to a deep cup the tone becomes dark, but still retains easy access to the upper register.
• 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