Vincent Bach MEGA TONE 1-1/4GM Silver Plated SP, Large Shank Bass Trombone Mouthpiece ★ Cup Diameter: 27.95mm ★ Throat: 8.1mm This model has the same rim and cup as the 1-1/4G, but with a longer throat and backbore. Mega Tone: Heavy Specification * This is a beautiful item, imported new from the US and only test-played a few times. Compared to the cup size, it has considerable weight on the lower side, resulting in a tight, highly focused sound. Due to its extreme balance, it may not suit all instruments, but it's a fun piece to have as a special weapon.