Elliptical Lock Up bit from Bombers.

Loose rings provide direct contact with immediate release, where the pressure on the tongue and bars stops as soon as the rider releases the rein and the bit returns to a neutral position in the horse's mouth.

The Elliptical Lock Up removes the nutcracker effect of the conventional three-piece, which means less pressure on the bars, but more on the tongue. The Elliptical Lock Up is therefore a softer alternative than a conventional Elliptical, but stronger than a Control Plate.
The Comfy mouthpiece is more curved than a regular mouthpiece, which reduces the pressure on both the bars and the tongue. Suitable for horses with a sensitive mouth.