The Bach 12C trombone mouthpiece is one of the common mouthpieces for beginner players. It has a medium size cup depth. The mouthpiece brings out a brilliant, crisp tone. This model mouthpiece is great for all-around playing.
The Bach 6 1/2 AL small shank mouthpiece has a medium deep cup depth. This model mouthpiece is recommended for trombone players who desire a round, mellow tone of great carrying power and substantial volume.