This refrigerator storage box is made of good plastic material, which can directly contact and store food, and does not contain harmful substances such as BPA. Keep your food in a fresh and healthy state. (Note: Cannot be washed in the dishwasher) The cover of the storage box is sealed, which prevents air from entering, thereby locking the moisture of the food, keeping the ingredients fresh, and prevent dust from entering. Provides 4 different sizes (size reference picture,) to help you create storage in the compact space on the refrigerator shelf.