A ring cheek piece introduces poll pressure as well as creating leverage on the mouthpiece, the 2½ Ring version is the softest out of the 3 or 4 ring alternatives as the ½ ring softens the leverage on the mouthpiece and poll.
The Colin Miles is a great schooling bit with a wide center piece creating greater tongue pressure and reducing bar pressure. The rings give the horse something to play with and help keep the horses attention on the bit.
The cheekpiece is available in 2 sizes, standard and a slightly smaller model for a pony. Supplied with a nylon back strap.
This particular joint exerts more pressure than the Control Plate or Elliptical.