This is a must for every baker! This baking mat works wonderfully as baking pan liner or as a working surface because of its silicon and fiberglass nonstick surface which makes it very easy to clean. It is completely safe in freezers or microwaves. It never needs greasing, can be used in all types of ovens (except direct fired ovens), and can withstand temperaturesfrom -40F to 480F. Non-stick 100% FDA approved food grade silicone mat.