Our Stainless Steel Cookie Sheet is substantially designed with multiple layers that conduct heat evenly and efficiently. It’s made with 5-Ply construction and has a T-304 surgical stainless steel baking surface. No other bakeware cooks so evenly! Most importantly, it's 100% American Made. As this is the case with every 360 Bakeware products. The Large Cookie Sheet is also covered by a Lifetime Warranty. The 17 1/2" x 14 1/2” area will accommodate lots of small cookies or just a few monster cookies! It’s also perfect for warming up frozen hors d’oeuvres for your next trouble-free get-together!