Mustang Balance Training System This quality training set is comprised of five pieces. Headstall and lunging caveson are double ply nylon and fully adjustable. The caveson is felt lined. Surcingle and breeching have nylon tops with felt lining for comfort. Lines and reins are sturdy bungee style. All pieces feature stainless steel hardware. The Mustang Balanced Training System comes with detailed instructions for use and benefits. Note: Highly adjustable to fit most average-sized horses. Not recommended for ponies or extra large horses.