The Zilco Copper & stainless steel roller snaffle helps keep the mouth moist and helps to assist in pacifying the horse whilst the D rings allow improved steering.13mm thick 60mm ring sizeWhat is the Dexter Snaffle Bit? Category of Bit: SnaffleThe jointed mouthpiece gives a nut cracker action which is more severe than an unjointed moutpiece. The copper rollers encourage the horse to accept the bit and the copper gives a warmer feel in the mouth as well as a nicer taste than stainless steel. The D rings of the snaffle give more steering control than a loose ring or Eggbutt bit. This copper roller snaffle should be readily accepted by most horses and can be a very good first bit for young horses to start them off on the righ footing. D rings improve steering control.