A necessity for any chef's kitchen. Baking professionals know that the secret to evenly-baked and perfectly browned food is to cook with aluminum bakeware. Aluminum is widely known for its excellent heat conductivity and cooks more evenly and thoroughly than other metals. Made of natural aluminum with no finish, the Baker's Half Sheet is the largest baking sheet on the market, measuring in at 13 inchx 18 inch x 1 inch, yet still fits within standard home ovens. Turns out perfect results every time, whether you're making bars, brownies, or cookies. Convenient lid for transporting and storing your baked goods. Proudly made in the USA by Nordic Ware. Use & Care: 1. Before initial use and after subsequent uses, hand wash with warm, soapy water. 2. Dishwasher use is not advised, as discoloration will occur due to the cleaning agents used in automatic dishwasher detergent. This discoloration is merely cosmetic and will not affect baking properties or safety of the pan. 3. Natural aluminum pans work well with parchment paper, silicone baking mats, and also traditional butter or shortening and flour methods. When roasting savory foods such as vegetables, butter or cooking oil work well. 4. Nylon, wood, or silicone utensils are recommended. Metal utensils and scouring pads may scratch natural aluminum pans, but will not affect baking performance.