Self-sealing can food lids. Tight seal keeps food fresh longer. It fits most cans, glasses and small containers. To use, place suction lid on top of an open can and slightly push in the center to form a vacuum seal. To remove, just break the vacuum seal and remove. Dishwasher safe. -Designed to keep canned pet food fresh after opening -Flexible self-sealing lid creates vacuum seal over can -No need to transfer pet food to another container for storage: use the Dexas suction lid instead -To use: place lid on can and press down in the center of lid to create a vacuum seal; pull up on edge to break the seal -Dishwasher safe