Nordic Ware Naturals Aluminum NonStick Baker's Quarter Sheet Bakers Quarter Sheet Natural Aluminum Nonstick Commercial Bakeware Is Made Of Pure Aluminum Which Will Never Rust For A Lifetime Durability Baked Goods Rise And Bake Evenly Due To Aluminums Superior Heat Conductivity And The Reinforced Encapsulated Steel Rim Prevents Warping Nonstick Interior For Easy Release And Clean-Up, Hand Wash Only