Specifically engineered to accommodate the larger or sensitive tongue.  Often negates the need to shut the mouth.

This design also adds stability often proving a confidence giver leading toward a more consistent contact. The Eggbutt reinforces the straightening and turning aids. Particularly useful for the young horse in order to establish the bend etc. Also highly recommended for the novice rider who may not fully support their inside rein as the Eggbutt will not allow the mouthpiece to slide across the mouth to the inside.