Bombers 4 Ring McHardyThe 4 Ring has 2 rings on the bottom to adjust the amount of poll pressure and leverage you want. A horse shaking its head when bit pressure is applied or its tongue trying to escape the bit are classic signs the horse has a sensitive tongue. With this in mind the McHardy was created, it has a medium port creating space for the tongue relieving pressure. The Buster Roller in the middle increases bar pressure and as a result lifting the horse's head