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Sturdy stretch lids are made of high-quality silicone, can be used for a long time. Heat resistance from 40 ℉（freezing) up to 400 ℉. Safe for Oven or Fridge.
1. Lids are completely dry or they will not stay in place.
2. When you are using it in Microwave or Oven, do not completely seal container would be better. Because the expanding heat and pressure from the container may result in damage or injury.
Start on the side closet to your body.