Made from food contact certified cardboard, our board lids provide an economical solution for covering and transporting food. These lids are ovenable to 220 degrees celsius for approximately 30 minutes (do not place lids near oven heating elements) and are also freezer safe. Matching container codes are 7420, 7720, 7620, 7920 and 7621. Printed for frozen meals with reheating instructions, blue print on white lid.