The Cherry Roller Loose Ring is a single jointed bit with a nutcracker action that works on the tongue, the bars of the mouth and can have action on the horses palate.
The stainless steel rollers around the mouthpiece of the bit apply increased pressure to the horse's tongue, helping with horses that attempt to put their tongue over the bit and prevents the horse from grabbing hold or leaning on the bit as it is fully mobile.
The Cherry Rollers encourage the horse to mouth and play with the bit, and being a fairly thick bit it is quite kind to the bars.