This model is on sale because it has been discontinued. It is very similar the the 667RT. Email email@example.com 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 mouthpiece comes on a Medium-Large backbore.