MDD Breastplate Silver Dollnouveau Store Stbben Breastplate Padded DocHorse bnwt stubben breastplate eBay UK Traditional Antique Sterling Silver Breastplate, Judaica, London 1922 Pro Jump Breastplate Stubben North America. Classic English breastplate with separately attached martingale fork. Can be used with or without the martingale fork this saddle accessory is as functional as it is elegant. The martingale rings are made from high quality, ultra lightweight plastic. Completely smooth on the inside, they ensure the reins slide freely and effortlessly. The breastplate prevents the saddle from slipping backward. It is therefore commonly used in show jumping, eventing, or with very round horses. It is also often used to attach a martingale, which prevents the horse from raising its head too high. When the martingale is attached to the breastplate, it serves a dual purpose.