Eggbutt Elliptical Lock-Up from Bombers.

Elliptical Lock Up is a three-piece mouthpiece with a locked, elliptically shaped center part. It is sharper than the Control plate because the contact surface against the tongue is smaller. This means that a horse that uses its tongue to push against the bit to take control will come back and tuck in its nose, making it easier to control. By locking the center part, the nutcracker effect is prevented, which results in less pressure on the horse's bars. This, in turn, slightly increases the pressure on the tongue, making it a sharper bit than, for example, the Ported kernel.