Calphalon Classic Bakeware 14-by-17-Inch Rectangular Nonstick Large Cookie Sheet Large, nonstick cookie sheet made of heavy-gauge, aluminized steel Heavy-duty construction means no twisting or warping Two-tone surface promotes perfect browning Oven safe to 450 degrees F; not broiler safe; not dishwasher safe Measures 14 by 17 inches; lifetime warranty