Reinsman Ported Roller Dee Ring Snaffle 5" Forward set modified Billy Allen mouthpiece with a center barrel Roller with copper in center of barrel provides some movement helping to pacify the nervous horse. Dee rings are fashionable with silver dots on the sweet iron Gives a soft, even pressure across the tongue, bars and lists. The center barrel has limited movement to prevent the bit from scissoring down into the tongue or up into the palate.