This cheekpiece has a D-shape. The D-rings ensure that the mouthpiece lies calm and stable in the horse's mouth. The pressure of the cheekpieces against the cheek makes it easier to turn by automatically pushing the horse’s head in the right direction. This makes the bit suitable for young horses. The shape of the cheekpiece makes it less easy to pull the bit through the mouth. The mouthpiece with rings is a variant of the double-jointed bit. The rings in the middle stimulate the horse to play with the bit. This increases the tongue activity so that the horse will produce more saliva and the jaws can relax more. 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.