Silicon coated on one side. Prevents food from sticking to the foil. (Look for r mark to identify correct side). Eliminates need for oil, making meals healthier. It eliminates requirement of coated cookware and post cooking clean up and it reduces number of pans (tava, frying pan, dosa tawa) required in your kitchen. One can make any pan fried food like dosa, uttappa, paneer tiki, omelet, fried eggs without using oil.