This new bit from Sprenger is designed to stimulate the horse to accept the bit more easily. The 14mm mouthpiece is Aurigan, the material that activates the chewing activity of your horse. The ring diameter is 65mm stainless steel. The ergonomically formed mouthpiece lies perfectly in the horse's mouth resulting in soft and even pressure on the entire tongue area, encouraging the horse to chew. In addition this bit supports the contact to the corners of the mouth in a very effective way, keeping the horse on the bit. It has the angled forward joint in the middle characteristic of the KK Ultra. The New Dynamic RS bit gives soft but very effect instructions for a better contact between horse and rider.