A Ring cheek piece introduces poll pressure as well creating leverage on the mouthpiece, the 2½ Ring version is the softest version of ring bit as the ½ ring softens the leverage on the mouthpiece and poll.
The Lock Up snaffle removes the nut cracker action of the conventional snaffle, meaning it will bear less pressure on the horse's bars. The Lock Up is therefore a softer option, than a conventional snaffle, although it still applies tongue and bar pressure when the reins are taken up.
