4 knot halters are used by many trainers world wide. Made in the USA using premium stiff 5MM polyester halter cord, these halters are made to last. Sizing: Yearling /Pony - One year old or a pony Arab - Fits most Arabs which tend to have a small muzzle Small horse - Fits most two year olds or horses with a finer smaller head Standard - Best one size fits all for adult horses Mule - Is bigger around the muzzle than a standard size Draft cross/large - Fits large headed horses Draft - Fits a true draft horse or extremely large heads