Eggbutt lightweight, mouthpiece from Sweet Iron. Sweet Iron has developed surface rust through contact with (air) moisture. The sweet taste of this surface rust naturally stimulates saliva production, making the bit more acceptable. The horse will foam more. Because the sweet iron has been heated for a short time, it has obtained the beautiful deep blue color. The rusting process (oxidation) changes the blue color of the sweet iron bits to brown-gray. Sweet iron can contribute to better communication between rider and horse. Mouthpiece composition: 100% low carbon steel. Rings are 23 mm stainless steel mouthpiece and 60 mm rings.