The chambon is a training device used on horses. It runs from the girth or the bottom of the surcingle, forks about half way, and continues to the rings on either side of the horse's head at the base of the ears. Running through the rings it follows the direction of the cheek pieces and attaches to the bit ring.
Chambons are advanced equipment, and should only be used by experienced trainers who are knowledgeable in the art of longeing. A chambon is not a quick way to fix the head set of a horse. It will merely to help develop the correct muscle. The chambon was originally intended for longeing and free schooling. However, some people now use it while riding.
If Longed improperly, a horse may begin to go on his forehand. Chambons can also cause sore neck muscles. Incorrect use of Chambons can therefore spoil a horse's gaits, which would then require weeks of retraining.