STC Horse Sense Argosy Lead25mm x 2. 75m lead with 32mm heavy brass snaps on the argosy fitting and a generous hand loop. The Horse Sense range is made from an advanced type of PVC coated Terylene which has remarkable strength, is lightweight, very easy to clean and the finished product looks impressive. Horse Sense includes a range of bridles, reins, halters, breastplates and martingales for eventing, racing, endurance, stock work, pony club or pleasure riding.