The Mikmar D-Ring Snaffle Bit with Ergom Lozenge is made from a material called Cupreon. Created specifically for horses, Cupreon is a superior quality, nickel-free, non-toxic copper alloy. Due to the composition and oxidation process, this new formulation warms easily in the horse's mouth, promotes salivation and encourages bit acceptance and softness. The Ergom Lozenge Mouthpiece is double-jointed and has a smooth link that is optimally shaped and sized for the horse's comfort. This mouthpiece is legal for dressage competition. 65mm rings.