Includes one Hamilton Extra Heavy Choke Chain Collar, 4.0mm Metal Slip Links, 30 Inch Length Safe & Convenient Training Tool: Slip collars are designed to let dogs know when it's time to heel Durability & Strength: Made with durable steel links that help to discourage pulling by applying pressure when the leash is pulled, encouraging dogs to step back and relax Available in wide variety of chain weight and lengths, Hamilton has an option for a large variety of dog breeds and sizes Leader in Pet & Large Animal Products since 1973: We use only the highest quality nylon, steel, thread, and hardware; Our focus is on providing quality products that are durable, stylish, and at an affordable price for small and large pets and animals