A perfect fit- multiple lid sizes stretch to fit a variety of shapes from small tuna cans to large serving bowls and everything in between. Thoughtful touches- textured interior grips offer a super tight cling on slippery glass and ceramic while exterior handles allow you to easily stretch and pull the lid into a taut airtight cover for leak resistant, stackable storage. The best materials- made from super stretchy and crystal clear silicone that is freezer safe, dishwasher safe, microwave safe, oven safe, and Bpa-free.