- 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 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 top is best used on an S (Small) backbore which can be purchased here.