Endorsed and played by the legendary Randy Dunn! This mouthpiece is specifically designed to give the rich, dark, blendable tone desired for symphonic and classical music, while still supporting upper register playing, even for extended periods. It has a .600″ inside rim diameter, a medium shallow to shallow bowl shaped cup, and the Legends Chicago backbore. Regardless of what kind of music you’re asked to play, with this mouthpiece you’ll GIT R DUNN!