This Stainless Steel Ball Chain is made from T304 Stainless Steel. It's a #3 size chain (3/32" or 2.4mm ball diameter) and 30 inches in length. The stainless steel ball chain is uncoated, has a matte finish and comes with a connector. T304 Stainless Steel is hypoallergenic and should not cause an allergic reaction even to the most sensitive skin. T304 Stainless Steel will not turn your skin green. T304 Stainless Steel resists scratches and dents much more than Sterling Silver. T304 Stainless Steel does not tarnish or need polishing. T304 Stainless Steel should not break with normal wear and tear. T304 Stainless Steel will out perform and outlast Sterling Silver in wear and tear for a fraction of the cost.