The outer layer of the pot is composed of pure aluminum. When stimulated by electricity, it not only does not rust but also becomes harder and generates harmless ceramic components to the human body. The inner layer is the same as the outer layer. After production, a layer of anti-sticking coating is applied. The coating film on hard aluminium lasts for a long time. The pot lid NH/NS is made of stainless steel, while the NA series belongs to hard anodized aluminum oxide. The inside of the pot lid is coated with a layer of ceramic film, which is also non-stick.