Made in Switzerland. Swiss Diamond 5.3 quart covered wok with rack features a revolutionary non-stick surface using diamond crystals to form a virtually indestructible non-stick cooking surface. The user will be able to stir-fry food to perfection. The non-stick surface will not peel, crack, or blister and provides perfect heat distribution. The wok is made from a 6mm thick pressure cast aluminum which has a perfectly flat base for use on all ceramic, gas, and electric cooktops. The stay-cool handle is ergonomically designed and is safe to use in an oven up to 500F. The pans diameter is 12.5" and inside depth is 3.5". Metal utensils are safe for use on the non-stick surface and the pan is safe for use in the dishwasher. The tempered see-through glass lid features a handle that also is a vent for venting steam while cooking. The diamond reinforced non-stick cooking surface separates this 5.3-quart wok with rack from all others in a way that will enhance the users cooking skills.