The bit is placed in the horse's mouth above its tongue to allow the driver of the 'Attelages du Val d'Amour' to lead it and to regulate its pace using the reins. It acts on the head, neck and shoulders of the animal. Depending on its shape, it pinches the tongue or exerts a simple pressure on it and always performs a traction on the corner of the lips. It can also press on the horse's lower jaw or on its mandibular nerve, so many sensitive areas of the animal.