Premium quality - Our dog collar is argon welded and chrome plated for maximum strength and durability, it will not easy tarnish, rust, or break. Recommended for professional training.Size adjustment - Before use, please measure dog's neck and add 2 -3 inches for initial collar length for Adjustment.Professional training - It's easy to train your dog with our dog chain collar. It is excellent for gentle control, great for Pit Bull German Shepherd Staffordshire Terrier Training Metal Gear Prong Pets Collar.Design idea - Designen to tighten under tension, correct the wrong behavior by pulling the leash with a gentle but effective feedback. Perfect chains for small medium or large dogs.Total satisfaction guarantee - If you have any problem about the dog training collar, or not happy with the purchase for any reason, please feel free to let us know. your fullest satisfaction is our top priority.