Running Martingale Beta Biothane®:This is a simple, fully adjustable, running martingale with stainless steel hooks that attach to your breast collar. Made from durable Beta Biothane®. Easy to use, and aids the rider in those first few miles, with a horse that tends to toss their head or carry it high. It can also be helpful to your horse, in teaching him where you would like him to keep his head positioned.