Paula Deen 9 by 13-Inch Cookie Sheet with Silicone Insert, Green Commercial style heavy gauge aluminized steel construction. Wire reinforced rim to resist warping and for extra strength and durability. Oven safe to 500F The silicone baking mat is great when used as a nonstick surface on top of your bakeware. Use it on your countertop for rolling dough or slid it under your cutting board to create a temporary non-skid surface. Quality Assurance Guarantee