Bach Trombone Mouthpiece 6 12AL, Silver-Plated Finish (Large Bore) 3416HAL

It has the same cup, throat, and backbore as the 6 1/2AL for small bores, but a shank for bass trombone (large bore). It's suitable for well-trained embouchures. This size is ideal for first-string players and other players who can produce brilliant high notes. ■Diameter: 25.4mm ■Cup depth: MD (slightly deep) ■Rim thickness: MW (medium), with a fairly rounded rim.