Rubber Cheltenham Gag
The gag bit works on the horse's lips and poll simultaneously. The pressure on the lips tends to make the horse raise its head, which is useful for a horse that tends to lean on the bit. Gag bits are used mainly for horses that are strong pullers. They can also be used to help elevate a horse that is heavy on its front end. It helps tremendously with brakes and is often used on horses that are strong, heavy in front (on the forehand) or too deep (head too near the ground).
The bit is recommended for use with two reins, with one set attached to the end of the cheek straps and one to the bit rings.