Vintage Tupperware Microwaveable 3qt Rectangular Roaster Vintage Tupperware Rectangle Microwave Stack Roaster Set from the 1990s for larger microwave cooking and reheating needs. This piece is for microwave, refrigerator and freezer use, not for use in the oven. It's recommended to use plastic or wood utensils within this roaster as metal knives will leave cut marks. The 3 Quart (part number 2340) measures 12 X 10 X 2 1/2 inches, Made in USA. Condition is very good with no chips, cracks, or cut marks. Please use care with serving utensils and it's recommended not to cut food inside the pans.