Black Oxide Stainless Steel Ball Chain Necklace - 3.2mm, 29.5" Stainless Steel Ball Chain Necklace is made of solid 304 stainless steel. Highly durable neck chain has 40 lbs of tensile strength. Larger than the standard military dog tag necklace, this chain can be used as a stand-alone neck chain. Perfect replacement necklace for military dog tags and other pendants that need a heavy duty chain. Proudly made in the USA.