Excellent bit for schooling or training your horse. It is excellent for young horses that get heavy or lean on the bit. This bit will lighten them up and bring them back off the bit. Sweet iron naturally rusts into a light patina. The rust creates a sweet taste for the horse and makes the bit more acceptable and increases salivation for a supple mouth. 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.