The Rolux Chain Competition Bit offers a larger chain link, enhanced by the Signature Copper O-Ring, preferred by most horses. The chain design molds to the shape of any horse's tongue for comfort, and works off of tongue, lip, bar, and curb pressure to help to lighten and resensitize even the heaviest of horses in any riding discipline. The curb adjustment enhances the feel and control of the chain bit and should be adjusted for the desired response.