Zilco Sweet Iron Western DeeStainless steel dees with a single jointed, sweet iron mouthpiece with western dee cheeks. Designed for dry mouthed horses, the sweet iron encourages salivation. Cob Size (12. 5cm 5") Mouth Thickness 12mm Ring Size 75mm Note: Sweet Iron bits are designed to rust. This effect is caused by oxidisation of the metal, and causes the bit to become sweeter thus further encouraging acceptance of the bit by the horse