The Market Harborough. It consists of a martingale body which ends at the breast with a ring, attached to the ring are two strips of leather with trigger hooks that pass up through the ring on the bit then connect to 1 of 4 D’s that are sewn on the rubber covered reins. The action is a simple one and is operated not by the rider’s hand, but by the horse’s head. A downward pull on the bit is exerted when the horse raises it’s head above the correct position. One Size Brown The Bridle and Bit are not included.