Bombers Blue Gag 3 ring cherry rollerSize 130 5. 1" A 3 Ring cheek piece introduces greater poll pressure as well as creating more leverage on the mouthpiece. The Cherry Rollers roll in the horses mouth giving him something to play with and reducing the likelihood of the bit being held in the horses teeth. They are constructed tightly so there is no chance of pinching. When pulling on the reins, the rollers allow the bit to move along the bars of the horses jaws as opposed to rubbing.