The aluminum construction of the trays means that these pans are not dishwasher safe, but they are very easy to keep clean and hand wash, and, because they’re aluminum, they’re completely rust proof! The reinforced, rolled edges not only keep your hands safe from dangerous sharp edges but also help to prevent the baking sheets from warping. | JUMBO Baking Sheet Twin Pack- 2 Aluminum Cookie Sheets - Rimmed Baking Sheets - Half Sheet Pans For Baking - Baking Trays | Wayfair