Material: High Quality - This choke collar/dog training collar is made of high quality stainless steel. It will not rust, discolor, tarnish or crack Fully welded links are certified extra strong links. Ideal for gentle control: it corrects bad dog behavior and stops pulling. Stylish and personalized design: Nine P training collars for obedience or walking. Safe to use for sporting and training your pet. WAIST MEASUREMENT - Please use a tape measure to measure the circumference of the soft dog’s neck or the widest part wide of the head, the leash is ideally 3 to 10 cm longer than the size of the dog’s neck. (For example, dog head/neck size is 40cm and dog leash size is 50cm).