Our patent pending slip leads are designed to teach and keep your dog at heal. What is different about our slip leads than any other on the market, is they are designed with a Quick Release Shackle that allows for immediate release if the slip cinches up too tight and starts choking the dog. They are made of heavy duty 1/2" polypropylene cordage which is waterproof and mildew-resistant as well as resistant to most oils, lubricants, and grease. The Quick Release Shackle also allows the lead to be used a traditional 4' lead if clipped directly to the collar. Made in Montana USA.