Used 4.5 times. With a lid. "Nitrided 4-layer processing" that makes iron rust-resistant. While retaining the appeal of iron frying pans that make delicious food, Vitacraft's unique "nitrided 4-layer processing" overcomes iron's weakness: "susceptibility to rust." Applying processing technology used in ships and aircraft, where rust is a major enemy, nitrogen is permeated into the iron's interior to increase surface strength, creating a rust-resistant, robust frying pan. The unevenness of the surface created by the nitriding process enhances oil absorption, and the more you use it, the more the oil blends in, making it a more user-friendly frying pan. Grilled items achieve a beautiful sear, and stir-fried dishes have a crisp finish.