Mrs. Anderson's baking mats are a must have item for anyone wanting exceptional results time after time. They are made of an FDA-approved silicone that is oven safe to 480 degrees F. Woven glass fibers sealed inside the mat assure even heating every time! When your baking is done everything releases with ease. Please do not grease your baking mat. These baking mats were designed to offer nonstick performance without greasing.