These lids replace aluminium foil and clingfilm which are so difficult to unroll and arrange over your dish! Just place them on top of a bowl or saucepan … As they stick, they create a vacuum which provides an airtight seal: your dishes and food will retain all their freshness! As they can go from the fridge to the stove or oven without problem, they are also perfect for reheating and simmering. Silicone. Dishwasher proof.