Quoted from the internet below: [Product Information] This is the dancyu cooking tool series, which makes the most of the quality of cooking tools used by professionals, while also being easy to use for home cooks. It is a pure copper omelet pan with a thickness of 1.2mm. It becomes easier to use as the oil becomes more familiar with use. It comes with a wooden lid, which is useful for placing freshly made omelets directly on it after flipping the pan, or for shaping them. Because it is made of copper, heat is transmitted softly and evenly, resulting in fewer unevenly cooked spots and less burning. It also maintains the appropriate temperature, so the omelet will be fluffy. The square design, which is not commonly seen, is also visually appealing. Size: Approximately height 4cm (excluding lid) x width 18cm x depth 18cm (excluding handle), thickness approximately 1.2mm, weight approximately 900g Materials: Body: Copper, Handle/Lid: Natural wood Country of Origin: Japan Notes: For gas stoves only Although there is some use, it has only been used a few times, and the pan itself is not yet seasoned with copper. The brand is dancyu, but the manufacturer is unknown. Thank you.