The Sprenger Copper Roller D-Ring 13 mm features copper-coated rollers that encourage chewing activity and promote a more responsive mouth-ideal for horses with a "dead mouth" or limited sensitivity.

The fixed D-rings provide steady positioning and direct pressure on the tongue and lower jaw, with gentle poll influence. The bit lies quietly in the horse’s mouth and is soft on the corners. The lateral guidance offered by the D-rings supports horses that tend to fall out through the shoulder while riding or approaching obstacles.