Stainless SteelApple scented mouthCopper roller468551 Happy Mouth Copper Roller Loose Ring bit with a circular ring that freely moves through the mouthpiece promotes relaxation from the horse. By using 99.9% pure copper in the center of the mouthpiece encourages horses to salivate and keep a moist mouth promoting relaxation and softening. Excellent bit acceptance can be achieved by this combination of Apple scented space age polymer mouthpiece and pure copper center roller.