Silver Phantom Jewelry Designer Pitbull Dog Collar, 20mm Wide, 680 lbs - Silver 20mm Wide Chain - Extra wide Cuban-style designer chain makes this the best pitbull, mastiff, or other large dog collar around! Ultra Strong Links - Fully welded links are certified to hold up to 680 lbs - we dare you to break it! 316L Stainless Steel - Solid Stainless Steel metal will NEVER tarnish, rust, or irritate your dog's skin. Polished Finish - Smooth, comfortable links won't damage or pull out fur and make for one cool dog collar! Sizing - Measure the widest point of your dog's head, wrapping under the chin and around the back of the head, right behind its ears. Add 2 inches to the measurement and choose the chain length closest to this number. If the number is between sizes, choose the larger one.