Raised ridge on bottom: Improves air circulation, cooks evenly, and prevents grease or oil from getting into the cooking area. Cleanup is a breeze: makes the Cleanup easier and faster, simply tossing in the dishwasher or a quick wash down the sink. Always keep your air pan clean Money Saver & Time Saver: The inner lining of the silicone air pan can be reused and protect the environment. Don't waste your money on a burnt parchment pad to save cleanup time. Durable Silica Gel: Made of food grade silica gel, non-sticky, non-toxic, Bpa-free, heat resistance up to 446(230), suitable for air fryer, oven, steam cooker, instant pot, microwave oven, etc. Preserve the non-stick coating: nothing sticks, protecting the non-stick coating from scrubbing, which is a good way to extend the usefulness of the air pan.