T-Fal AirBake Cookie Sheet Set -- 3 Sheets (14x9, 14x12, 16x14). AirBake is the original insulated bakeware since 1933. High quality, durable AirBake cookie sheets. Micro-Dome base bakes 15% faster. AirBake natural aluminum -- guaranteed not to rust. The AirBake bottom sheet blocks the direct oven heat while the layer of air acts as an insulator preventing the top sheet from overheating. This AirBake cookie sheet set is the perfect gift for anyone who love baking!