Our blank sterling silver dog tag comes with a 2.4 mm ball diameter 24" sterling silver dog tag chain, which is made at our factory in Mount Vernon, NY. Please note that all sterling silver naturally tarnishes over time. When worn continually, sterling silver develops a lovely patina. If you would like it to maintain its original luster just gently rub a small amount of sterling silver cleaner on the surface, rinse and dry. These make great gifts for military service members, retirements, children's births or any special occasion.