Martin Saddlery String Martingale is a simple and effective training tool for horses. This Western string/rope running martingale is lightweight but durable. It's adjustable so it will fit lots of different horses and is easy to use. The stainless steel rings won't corrode and are sized large enough to fit different kinds of reins. The rings are designed to stay away from your horse's shoulders. Martin Saddlery String Martingale has a snap to attach to the cinch. Low maintenance, low profile and easy to store when not in use. One size. White.