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 aluminum alloy bonded to the Eterna nonstick interior surface which requires minimal butter or oil to release food easily but offers the searing quality of traditional fry pans. The 5 layers work together to transfer heat quickly and evenly for efficient cooking.