The cooking surface and cube pattern in with ingredients are made of stainless 304, which is harmless to the human body! The middle layer is made of high-purity aluminum 3003 with exnt thermal conductivity! The outer bottom surface is made of stainless 403 which is induction-able and has exnt durability!The whole product has a triple structure, so cooking is fun with quick and even thermal conductivity. Kim's Cook's products are safe.It is a coating in which PFOA, a substance harmful to the human body and the environment, is not detected.Cook with confidence.