Specially handcrafted in the USA, Viking 5-ply Professional Cookware brings commercial grade quality to in-home use. 5-ply construction maximizes heat transfer and reduces energy usage, enabling Viking cookware to deliver superior cooking performance. The exterior layer is magnetic stainless steel that makes the pan suitable for induction cooktops. The next layer of aluminum alloy bonds to the middle layer, which is pure 3004 aluminum. The fourth layer is an aluminum alloy bonded to the interior Eterna nonstick surface which requires minimal oil or butter to release food easily but offers the searing ability of traditional fry pans. The 5 layers work together to transfer heat quickly and evenly for efficient cooking.