This unique gag features a polished steel cheek with silver dots and allows for natural flexion and lift in the shoulder. All of these bits should be adjusted to fit with one wrinkle in the horse's mouth. Sweet iron keeps a horse's mouth moist allowing the bit to move freely. This mouthpiece will apply more palate and bar pressure and is an excellent all-purpose mouthpiece which will work well on most horses. Sweet iron keeps a horse's mouth moist, allowing the bit to move freely.