Product details say stainless steel, however, it has the lightweight feel of thin aluminum. This product is made in China and the box it comes in is entirely in the Chinese language. It appear to cook well enough to prepare soups, stews, sauces and vegetables. It also works good as a steamer for dim sum, pot stickers, dumplings and ravioli. Personally, I would prefer a 4 inch deep Dutch oven with steamer insert and stainless steel lid, rather than a glass lid. Also, would prefer a heaver gauge steel construction.