Liberaris Cooking Dish [Manufacturer's Description] 5 functions in 1! Just heat it in the microwave. This convenient microwave cooking container can steam, simmer, boil, cook, and bake with just one dish. It's also refrigerator and freezer safe and can be used as an airtight container. It makes cooking fun and brightens up the dining table. Achieves high heat resistance! The main body is made of heat-resistant polystyrene resin with a heat resistance of 220°C. You can "steam, simmer, boil, and cook" in the microwave, and "bake" in the oven range. With this one dish, you can easily make oven range dishes like gratin. Note: Do not use directly over a flame, in a gas oven, or in an oven toaster. Functional lid with air valve and packing The air valve releases steam from inside the container, allowing you to heat it in the microwave with the lid securely closed. This increases heating efficiency and eliminates the need for plastic wrap, making it economical. The silicone packing enhances the airtightness of the container, moderately increasing the pressure inside the dish during cooking, improving heat transfer, and preventing the loss of the ingredients' flavor. It also provides sufficient airtightness for use as a storage container. Beautiful form that can be used as a dish The design also focuses on the dish's appearance, allowing you to place freshly cooked food directly on the table. A cooking dish with high heat resistance, compatible with ovens and microwaves. You can steam, simmer, boil, cook, and bake with just this one dish. It has an air valve, so you can cook in the microwave with the lid closed. The container has a beautiful form that can be placed directly on the table after cooking. Refrigerator and freezer safe. There are minor scratches from normal use. I have several, so I am selling one. This item is currently discontinued and difficult to obtain. I will include the start guide book from when I purchased it. Please understand that this is a used item.