Similar rim to 6 1 1/2 but 1mm bigger cup. The throat is 0,25mm bigger than 6 1/2.
Big sound. Ideal for first trombone in orchestra and band. The most used mouthpiece in the symphonic trombone. Very powerful and a lot of projection in the sound.
Inner rim diameter: 25mm
Outer rim diameter: 39mm
Cup depth 30mm / Throat 7mm
Backbore Medium Symphony
Rim options: F semi flat - S rounded