Our top-rated Naturals®Bakeware collection is made of pure aluminum for superior heat conductivity and produces consistent evenly browned baked goods every time. These premium pans have a lifetime durability and will never rust. Encapsulated galvanized steel rims prevent warping. Creativity meets natural aluminum sustainability. Features: Even Heating Recommended Utensil Material: Nylon, Silicone, Wood Shape: Rectangle Measurements: 1 Height/Inches, 9.62 Depth/Inches, 13 Width/Inches Maximum Temp (f): 400 Degrees F Base Material: 100% Aluminum Bakeware Size: 12 Cup Muffin Care: Hand Wash Material: Aluminum Country of Origin: Made in US