Dog tag chains are used to attach a pair of dog tags to the neck. A larger 24 or 27 inch dog tag chain goes around the neck. A single dog tag and smaller dog tag chain, usually 4 or 4.5 inches in length, are attached to the larger dog tag chain. A second dog tag is attached to the smaller dog tag chain. Our dog tag chains are made in the USA by a government supplier and are made of stainless steel.