Bach small shank mouthpiece for trombone. Universally adopted, recommended by many music teachers, this mouthpiece is suitable for both beginners and the most demanding musicians

Rim
Wide: Increases endurance.
Narrow: Improves flexibility, range.
Round: Improves comfort.
Sharp: Increases brilliance, precision of attack.

Cup
Large: Increases volume, control.
Small: Relieves fatigue, weakness.
Deep: Darkens tone, especially in low register.
Shallow: Brightens tone, improves
response, especially in high register.

Throat
Large: Increases blowing freedom,
volume, tone; sharpens high
register (largest sizes also sharpen
low register).
Small: Increases resistance, endurance,
brilliance; flattens high register.