Kitchen World Nonstick Marble Coated Pans, Set of 4 Pans Premium Quality Cast Aluminium with 3 layers of Non-Stick Coating plus 1 layer of Marble Coating makes this wok totally non-stick Marble coating both inside and outside makes cleaning this pan the easiest ever Marble coating is 10x stronger than teflon and last much, much longer The sizes are 20, 24, 26 and 28 cm. Can be used with gas, electric or induction cookers Made in Korean. Eco Friendly and Healthier way to cook