WarningTo use microwave, please do follow the directions in the user manual to avoid breakage of the container. Frequent impacts on the container may cause breakage.Any scratch from abrasive cleaners may cause breakage.Do not pile up the container without lids. Sudden temperature changes may cause disfiguring or breakage of the container. Do not pile up the container without plastic lids. Do not use in oven, direct fire, or under burning element. Do not heat highly oiled substances, it may cause breakage of the container.