-The main body has a four-layer structure of stainless steel + aluminum with excellent thermal efficiency. --Adopt the highest grade of the POLYGO series [Maxi Primus]. It prevents sticking and burning, and is easy to clean. It has passed 2 million abrasion tests. It is PFOA-free and safe. -The handle part has the same design as the one-handed handle of Vitacraft's standard stainless steel pot. It fits perfectly in your hand, is easy to use, and does not cause stress. ――The entire manufacturing process is consistently carried out in Japan, from molding of the main body to polishing, coating of the inner surface, installation of parts, and packaging.