*If you have purchased a new Pro series freeze dryer (Since Aug 1, 2023), these lids work perfectly for covering trays of food and freezing in a freezer. However, they cannot be used for freeze drying if you have a Small or X-Large Pro freeze dryer. • Great for covering food and stacking trays in freezer when pre-freezing food • Lids snap directly onto Harvest Right trays (small, medium, large, x-large) • Perfect for saving space in your freezer • Use these lids as trays when freeze drying. They work as well as the stainless steel trays. • 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.