Absolutely the very best for young or tender mouthed horses. Works wonders on developed horses. Revolutionary polyurethane mouthpiece is apple scented and easily accepted. This material will not peel or flake. The Happy Mouth bit is long-wearing, nonallergenic and stimulates salivation for greater response. It is shaped to fit the tongue and bars of the mouth. The mouthpiece cannot pinch or damage. Stainless steel rings or cheeks, with stainless steel reinforcing inside the mouthpiece.