The loose ring is a standard cheekpiece. This cheekpiece has loose rings which allows the bit to move more freely in the mouth so that many horses accept this bit well. Because of the loose rings, the aid is conveyed indirectly. To prevent lips from getting pinched, it is advisable to provide the bit with bit rings. The Dr. Bristol mouthpiece is a double-jointed mouthpiece with a flat centre piece. The centre plate in a Dr bristol eggbutt is angled and flat edged. Working primarily on the tongue with a sharp action due to the staight edged angled plate, and to a lesser degnee on the bars. It can be useful for strong horses or those that pull. The Sweet Iron bits are made of steel and have a recognizable blue color. Sweet Iron will rust when it comes into contact with (air) humidity, the surface rust tastes sweet and naturally stimulates the saliva production. This will cause the horse to salivate more, which in turn will encourage a better acceptance of the bit.