4-piece Sil-Eco US Half Sheet Silicone Nonstick Baking Mat Set Made of silicone; withstands temperatures from -40 degrees f to 480 degrees f Measures 11.625 x 16-inches; fits 13 x 18-inch baking sheet; nsf and fda approved Re-useable for thousands of times; Helps baked goods brown evenly Nonstick Silicone Baking liner by sil-eco; Safe to go from freezer to oven and microwave oven Set includes Four (4) Sil-Eco Silicone Nonstick Baking Mats, Half-Sheet Size