Pure copper is a soft, warm metal. By using 99.9% pure copper in the center of the mouthpiece, bit acceptance is improved. The taste of copper encourages horses to salivate and keep a moist mouth. Bits made of copper can have a very positive effect by 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. Features pony-sized rings for size 4.5".