The mouthpiece cannot pinch or damage the corners of the mouth and is very effective on young horses. Ideally used with double reins - the curb rein, applies poll pressure to lower the horse's head and curb groove pressure to tilt the angle of the nose in towards the chest. The snaffle rein has a more direct contact with the horse's mouth. It can also be used with rein connectors and therefore a single rein.
