Tramontina gourmet hard anodized cookware is harder than other conventional cookware.Hard anodization is a manufacturing process that treats the aluminium to make it harder and more durable.The result is a solid coating distinguished by its dark grey colour.This process creates a surface typically harder than other conventional cookware.The Tramontina hard anodized cookware is part of the company's gourmet collection, a series of premium products engineered and manufactured with the finest design, materials and workmanship, outperforming similar products within the market and delivering the best quality and value to the cooking professional and enthusiast alike.NSF-Certified.Made in USA.Lifetime warranty.