Double-jointed Pelham bit with an anatomically shaped Sweet Iron mouthpiece. Bit thickness: 13mm Rings: 70mm When in contact with moisture (air), surface rust forms on Sweet Iron. The sweet taste of this surface rust naturally stimulates saliva production, which makes the bit more readily accepted. The horse will foam more. Because the Sweet Iron is heated for a short time, it has acquired a beautiful, deep blue color. The rusting process (oxidation) turns the blue color of Sweet Iron bits to brownish-gray. Sweet Iron can contribute to better communication between horse and rider. Bit composition: 100% low-carbon steel Rings: stainless steel