Pyrex Professional Large Cookie/Jelly Roll Cookie Sheet Large cookie sheet constructed from commercial-weight steel for fast, even heating Markings indicate where to place cookie dough and where to slice when making bars Extra-wide edges allow for a secure grip even when wearing oven mitts Dishwasher-safe; oven-safe to 350 degrees F; metal-utensil safe Measures 18 by 13 inches; limited lifetime warranty