Our plant fiber catering trays are made from wheatstraw fiber. Wheatstraw is not only an annually renewable resources, but can also be turned into products normally made from plastic or paper. Wheatstraw is the remaining plant material after the wheat grain and chaff have been extracted. Can be used for both hot (220° F) and cold items. Microwave and freezer safe. Lined with NatureWorks Ingeo[TM] for enhanced leak resistance. Gluten-free. Conforms to FDA guidelines for food use. Wheatstraw is the remaining plant fiber after the grain (which stores the proteins and allergens) has been removed. 12.73" L x 10.37" W x 2.76" H.