Simply Calphalon Nonstick Bakeware Large Cookie Sheet. The flat, heavy-bottom pan has a wide surface to provide even heat. The sloped sides are designed for easy tossing and rolling. Cook with confidence no matter what you have on the menu. Experiment with a new dish or cook your tried-and-true favorites with ease. The revolutionary Calphalon Unison Slide Nonstick surface releases foods effortlessly, making even the most demanding culinary creations simple to prepare. Cover: Domed, tempered glass with stainless steel rim, oven safe to 500 degrees F. Product dimensions are 12 by 17 inches.