The cooking surface of this black cookie sheet measures 8.5in x 13.5in while the entire dimensions are 10in x 15.75in x 1cm. Carbon steel core with porcelain coating. Pair with Lasagna/Bake pan to make a lidded baking dish ideal for solar cooking. Fits into the SOS Sport and Tulsi Hybrid. When lidded with Lasagna/Bake pan, can also be used in the CooKit. Size not compatible with the Global Sun Oven.