This square copper frying pan from Marushin is perfect for making Kanto-style Japanese tamagoyaki omelettes.
Copper has excellent thermal conductivity and heat retention properties, so the heat can spread uniformly over the cooking surface. As a result, you typically use less energy while cooking, and the omelette will be cooked more evenly, with fewer dak spots.
Copper cookware is very durable, hygenic, and corrosion-resistant. The square shape of this pan is in the Kanto (eastern Japan) style, so if you're interested in cooking Kanto-style omelettes, it's perfect for you.
After using the pan, wait to cool down and clean with kitchen paper. Brush the pan with a bit of oil and store.
Another option is to clean with a sponge and soak lightly if you are concerned about oil.