The Dalehead, which has a sliding cheek is part of Hilary Vernon's Informed Bitting Collection from Abbey bits. The range is designed to compliment mouth conformation and improve communication, to promote humane control. The top rein option on the bit ring itself just pulls the mouthpiece back in the mouth, without bringing any leverage to bear. If you choose to put the rein down into the bottom slot of the bit ring, you get a more defined signal, and a little poll pressure; the mouthpiece rotates down into the mouth to give a clear signal to the horse to yield to the action. The middle rein option, where the rein sits in between the loops, brings a little more leverage to bear than the top ring option.The cheek piece of your bridle into the top slot of the bit ring, this sits the bit up in the horse's mouth and stabilises it, taking some of the weight off the horse's tongue. A curb chain or strap must be used with the Dalehead to distribute even pressure on the horse's jaw, which will help stabilise the bit and prevent it rotating too far downwards into the mouth.