Air-tight Sealing & Leak-proof Our silicone lids have strong sealing to keep food fresh, easy to create a perfect seal on glass, plastic or metal containers. It's helpful to keep kinds of foods fresh, and prevent spilling and spattering. Easy to clean Easily wash silicone stretch lids with warm soapy water. Since it is dishwasher safe, you could just put them into your dishwasher after use. You can use these again after washing. Our lids are more sustainable than plastic wrap, zip-top bags or traditional storage containers. Tips: Please do not use abrasive or force-foam cleaners when cleaning or will reduce product life. Caution To avoid slippage due to the nature of the silicone material, make sure that your hands, the outer edge of the bowl, and the silicone lid are completely dry (free of oil and water) during handling. Do not stretch beyond the maximum diameter specified in the specifications when using. Otherwise, it will affect air-tightness. When using in the microwave oven, do not tighten the lid completely, exposing a small opening. Material and scope Reusable silicone lids Made from flexible silicone, stretchable bowl covers adapts to numerous surfaces, materials and shapes. The flexible silicone material stretches to perfectly fit every oddly shaped container (even the square ones!). Apart from storing leftovers, it can be used as a cover on pots to retain heat after cooking, as a splatter screen in the microwave while reheating, and for outdoor use to keep food safe and away from bugs.