- Inner Diameter: .640 measured .04 inches into the cup.
- Outer Diameter: 1.094
- Cup Depth: This mouthpiece has an ES (Extra Shallow) cup, which is similar to a Schilke 6A4A, Schilke 10A4A, Schilke 13A4A, Bach 3E, and GR ES cup. It is intended for maximizing upper register performance when playing commercial lead or similar types of playing. This cup produces a bright sound excellent projection while still maintaining an accessible lower register that unlike other shallow mouthpieces does not sound restricted.
- Backbore: This mouthpiece comes on an Small backbore.