UNIVERSAL GLASS LID with AIR VENT: It is a fantastic new way to make cooking fun. With the silicone edge and air vent on this lid, you can see your food while it's cooking without lifting the lid and losing all the steam you've created. Plus, the silicone edge provides extra protection against chipping. DURABLE MATERIAL: The tempered glass is durable enough for use in both the oven and the dishwasher. This means that you don't have to worry about it getting damaged when you take it home to clean after cooking. HEAT RESISTANT GLASS: They're also made from strong, heat-resistant glass and have silicone edges for a secure fit in your pans. They're oven-safe to 220C and are easy to use on any kind of stovetop cookware. SOFT AND FLEXIBLE EDGE: The silicone edge is soft and flexible, so it fits snugly on your pan, and it has an air vent to help moisture escape so that your food cooks faster. These lids can be fit in three sizes: 16cm, 18cm, 20cm and are perfect for replacing or adding on top of any pans that need them—you'll never burn another meal again! TRANSPARENT GLASS LID: This set of lids gives you the ability to see what's going on in your pan at all times, so you can tell when it's time to take them off the heat. No more guessing!