High quality, FDA food grade approved, BPA free and Freezer safe silicone lids, which will create a perfect seal on pyrex, anchor, corningware, corelle, or any other plastic or metal containers for secure fit, helping to keep food fresher and for longer. Extra thick silicone is durable and will not tear or warp. They can be used over and over again, and are microwave, dishwasher, oven safe and freezer safe. They will remain intact even in freeze or heat within the temperature rated -40F/-40C to 446F/230C. Stretch lids cover will stretch almost 40 % of its original size to fit any 3"-10" containers. Silicone tops are round yet stretchy enough to fit snugly over odd-shaped mugs, pots, cups & bowls. Set of six convenient sizes that will fit containers of various sizes and shapes, fruits or vegetables.