- Very close to a Bach 3C diameter
- Inner Diameter: .665 measured .04 inches into the cup.
- Outer Diameter: 1.119
- Cup Depth: This mouthpiece has an MD (Medium Deep) cup, which is similar to a Bach 1 1/2 C or 5C, Warburton MD, regular Schilke, Yamaha C, or GR MX cup. This cup produces a large, dark orchestral sound.
- Backbore: This top is best used on an M (Medium) backbore which can be purchased here.