The Loose Ring Tube cheekpieces lies flat against the horse's face giving a more solid feel against the side of the face, while preventing pinching of the lips and the bit being pulled through the mouth. The mouthpiece is quite fixed in the mouth and concentrates pressure on the bars but the loose rings allow for a quick release.
The French Link is useful for horses that dislike the 'nutcracker' effect. The French Link figure 8 shaped lozenge rests vertically on the horse's tongue applying harsh pressure but reduces the direct pressure on the outside of the bars of the mouth.
This bit is stronger than the Control Plate and the Elliptical.