SIZE - Length: 24'' (61cm), Width: 15mm (0.59inch). 24inch recommend dog's neck 20inch. GREAT MATERIAL - 316L Stainless Steel metal with Gold Plated, it will never tarnish, rust, or irritate your dog's skin. PROTECT SKIN - Constructed of premium quality smooth & rounded stainless ,skin-friendly BEST COLLAR - Our dog collar makes your dogs look badass and fashionable, but is strong enough to control a large animal. SIZE MEASURING - Please use a soft measuring tape to measure the circumference of the dog's neck or the widest part of the head. And the dog chain is better 3-4 inches longer than the dog's neck size. For example: the dog's neck size is 18inch, the suitable dog chain size is 22inches.