1, This product is cast iron, no anti-rust layer, so it needs to be opened before use. Black swarf may fall off when you start using it. Only the carbonized vegetable oil layer falls off, don't care.2, After the initial use, you can brush a layer of oil, otherwise it will rust easily during storage. If you have any questions, please contact customer service to solve. 3, cast iron cookware is made by sand mould. Each pot body is a separate sand mold. After the hand is polished and trimmed, the inner and outer walls of the pot are not polished, so the surface will not be like stainless steel cookware or fine iron pot. Smooth, the surface will be smoother and brighter as the use time increases. 4. Shallow pits, sand holes and bulges on the surface of cast products are normal phenomena and cannot be avoided. They are not quality problems.5. Before use, clean the pot with boiling water. The pot may leave a small amount of material at the factory. You need to boil water for 10 minutes before use. Wash it in the steamer and dry it. 6. Fish maintenance: Please use after each use. Scrub clean, place in a dry place, avoid food , rustRubbing with an unsaturated cooking fat, such as canola, vegetable, or corn oil, then place on a high heat or in oven until slightly. It is recommended the maintenance is performed as soon as possible after cooking, this includes any cast iron cookware that comes with lids.