One of the best schooling bits, this is a great tool when used with the intent to lighten up the horse's head and back him off the bit, then return to his normal bit after the desired result is achieved. Inlaid scrub board copper causes the horse's mouth to salivate to keep it soft and supple. Mullen relief is used on all our snaffle mouthpieces which is a forward curve that creates even pressure across the bars and tongue to eliminate the nutcracker effect.