This mild snaffle bit affects the horse by applying pressure on the tongue, bars and the corners of the mouth. The added weight of the O-rings and the hinged mouthpiece action gives horsemen more control and poll pressure. The copper dogbone mouthpiece encourages salivation and keeps the mouth soft. It is designed for all disciplines and any level of horse. Rings: 3 ¼" Mouth: 5 ¼"