The jointed mouth loose ring pelham has a single jointed mouthpiece which acts on the bars and sometimes the palate of the horses mouth. The broken mouthpiece can effect the way the curb comes into play and lessen the direct action of the curb, but putting more pressure on the bars of the mouth and possibly the palate. The jointed loose ring pelham can be good for horses that tend to put their head down as the jointed mouthpiece often has the effect of raising the horses head.  Loose ring pelhams are designed to give the appearance of the horse wearing a double bridle but with only one mouthpiece, useful for horses that are being shown but dislike or do not have enough room in their mouth for a double.