Detailed Product Description 20-34cm diameter, The non-stick coating we use is AKZO NOBEL from USA, we also use coating from South Korea, we have got FDA, LFGB certificates on health. The product is powder surface outside, two layers of non-stick coatings inside, nice look, freely combine, easy to clean, the thickness of product can be 2.0mm-3.5mm, usually 12pcs/ctn.