These are military grade "flex cuff style" extreme zip ties. The ActionTrax can be linked together through the slots in the ends to form temporary roads for high use areas or where several vehicles need to make a short difficult climb out of a riverbed or some other such obstacle. These zip ties do not release. They are one use and done. It takes a sharp knife to cut them loose. They have many purposes and are a great all around addition to your field repair kit. Price is per zip tie. Not cheap but US made and top quality.