3.5MM Large All Metal Pinch Collar Dog Training Aid Absolutely Humane and Scientific Recommended for Unruly & Disobedient Dogs: Walking your dogs can be tough when they're constantly pulling on the leash or barking at passersby. When dog pulling, link's round head will evenly apply remind. Which mimics the correction that a mother dog naturally gives to her puppies. Adjustable size, You can add or remove individual chains on the dog prong collar to fit your dog's neck as needed. This durable dog collar is made of high quality stainless steel with rust and water resistant construction for years of use.