All Silicone lids have 6 various sizes, using premium silicone material and getting thicker groves on the edges providing a maximum seal. These are smooth and stretchy enough to snuggle over odd-shaped containers to prevent spilling and keep food fresh. It will not be slip easily when the container is wet or high heat. They can expand to fit many containers: such as a bowl, cups, glassware, pyrex, jar, food can, instant pot, crockpots. Suitable for fruits and vegetables. They are anti-freezing and heat-resisting. Approved Dishwasher, Microwave and Freezer safe so you can enjoy delicious leftovers conveniently.