These bits stimulate the horse to accept the bit more easily. The ergonomically formed mouthpiece lies perfectly in the horses 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.The gentle joint in the middle which is angled forwardthe characteristic feature of the KK ULTRAand the fine eggbutt design makes it a very friendly bit. The mouthpiece is made of AURIGAN, the material that activates the chewing activity of your horse.The new DYNAMIC RS bit gives soft but very effective instructions for a better contact between horse and rider.