High-density plastic. Versatile in use. Microwave and oven safe to 400°F (lid is not). Freezer and dishwasher safe. Dimensions: 10W x 6.5D x 2.5H inches. A little of this a little of that. creative casseroles are a cinch when you have the Nordic Ware Microwaveable 28 oz. Casserole with Cover. The durable two cup Microwavable 28 oz. Casserole with Cover is microwave safe and oven safe up to 400 degrees (lid is not oven safe) and leftovers may be stored in freezer. Use the casserole dish for storing soups too. This casserole dish is just another convenient item from Nordic Ware that helps you create fast and easy meals. About Nordic Ware. Founded in 1946 Nordic Ware is a family-owned American manufacturer of kitchenware products. From its home office in Minneapolis Minn. Nordic Ware markets an extensive line of quality cookware bakeware microwave and barbecue products. An innovative manufacturer and marketer Nordic Ware is best known for its Bundt Pan. Today there are nearly 60 million Bundt pans in kitchens across America. The Nordic Ware name is associated with the quality dependability and value recognized by millions of homemakers. The company's extensive finishing technology and history of quality innovation and consistency in this highly technical and specialized area make it a true leader in the industrial coatings industry. Since founding Nordic Ware in 1946 the company has prided itself on providing long-lasting quality products that will be handed down through generations. Its business is firmly rooted in the trust dedication and talent of its employees a commitment to using quality materials and construction a desire to provide excellence in service to customers and never-ending research of consumer needs.