Similar rim to 5G but smaller cup similar to 6 1/2
First trombone and soloist. Easy sound with a good sound projection. Ease in the high register. The most used mouthpiece among students.
Inner rim diameter: 25,25mm
Outer rim diameter: 39mm
Cup depth 29mm / Throat 6,75mm
Backbore Medium Symphony
Rim options: F semi flat - S rounded