The Fulmer snaffle is a loose ring variation of the full cheek bit.

 The rings allow for more movement in the horse’s mouth, which is ideal for horses that need the support of a full cheek but also have a tendency to lean or fix on the bit.  This bit can be used with keepers on the bridle to help keep the cheeks in position.  The side shanks assist with steering and applies pressure across the lips and bars of the mouth. 

The French link bit is more acceptable to horses with a low palate as it does not have the nutcracker action of the single jointed snaffle.  The mouthpiece lays flat on the tongue and allows for more movement resulting in a lighter, offhand ride.  The rein pressure is more evenly over the bars for a more independent control over the two sides of the mouth.