This model is on sale because it has been discontinued. It is very similar to the 67RT. Email firstname.lastname@example.org if you have questions about this mouthpiece.
- Inner Diameter: .670 measured .04 inches into the cup.
- Outer Diameter: 1.124
- Cup Depth: This mouthpiece has a D (Deep) cup is similar to a Bach 3B or 5B, Warburton D, GR LX, Schilke D, or Yamaha D. This cup produces an exceptionally big, dark sound.
- Backbore: This top is best used on an ML (Medium-Large) backbore which can be purchased here.