Great for covering food and stacking trays in freezer when pre-freezing food, Lids snap directly onto Harvest Right trays. Perfect for saving space in your freezer. Use these lids as trays when freeze drying. When used for freeze drying, the food doesn't stick to them. Great for things that are sticky. Don't need parchment paper or silicone inserts. When used as trays they are perfect for liquids as the liquids are less likely to slosh and spill over the sides. | Harvest Right Set of 5 Medium Lids for Dehydrator