DuraCore® Stainless Steel Archwires are specifically designed with a special alloy that provides maximum spring while minimizing wire fracturing. These archwires feature permanent laser-etched midlines for quick and easy identification and accurate placement. The upper archwires have 3 black laser marks, and the lower archwires have 1 black laser mark. When you need high performance Stainless Steel archwire, choose DuraCore® Stainless Steel Archwires.