Make mega batches of cookies and bars with this extra large sheet pan. Fits all standard size ovens. 35 percent larger surface than the half sheet! Our commercial-duty Naturals Bakeware is made of even-heating, rust-proof aluminum and features a galvanized steel reinforcement around the rims for added strength. Bakers agree that aluminum bakes best. Hand-wash cleaning only. Made in the USA. Nylon, wood, or silicone utensils are recommended. Metal utensils and scouring pads may scratch natural aluminum pans, but will not affect baking performance