Our top-rated NaturalsBakeware 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. 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. Set includes 12.25" x 8.87" x 0.9" Naturals Quarter Sheet, 15.12" x 10.75" x 0.9" Naturals Jelly Roll Pan and 17.25" x 12.25" x 0.9" Naturals Half Sheet Hand wash with warm, soapy water. Natural aluminum pans work well with parchment paper, silicone baking mats, and also traditional butter or shortening and flour methods. Nylon, wood, or silicone utensils are recommended. Metal utensils and scouring pads may scratch natural aluminum pans, but will not affect baking performance.