PURE UNCOATED ALUMINUM & SUPERIOR HEAT CONDUCTION: Crafted from 100% bare aluminum with NO chemical coatings safe, toxin-free cooking. Engineered for lightning-fast, even heat distribution (up to 30% faster than steel!) for perfectly crispy cookies, golden roasted veggies, and juicy meats every time. The aluminum baking pans are made of thick and heavy aluminum, with a heavy rolled edge making this truly "commercial-grade" that provides maximized scratch resistance. NO MORE BURNT BOTTOMS: They perform better than ordinary stainless steel baking pans in terms of heat resistance and cook everything evenly, withstand temperatures of up to 500 F / 260 C without warping. Foods bake evenly due to aluminum s superior heat conductivity. HEAVY-DUTY 18-GAUGE CONSTRUCTION (0.8mm" THICK) RESISTS WARPING! Premium extra-thick aluminum prevents bending in high-heat ovens.