Material The product is made of food grade silicone material, BPA-free, healthy and safe, with robustness, high temperature resistance and long service life. Silicone lid set has a total of 5 different sizes, which meet your different needs on different occasions and can accommodate almost anything.Universal lids for beer glasses and other glasses, coffee, beverages, mugs or as can lids - perfect for garden parties, camping, vacations, family celebrations, as insect repellants or as warmers for the coffee mug.How it works The way vacuum lids work is to gently press the center and the lid creates an airtight, watertight and leak-proof seal. You can then use them to store leftovers, groceries, salads, vegetables, pasta, soups, ingredients, etc. They are also ideal for cooking, keeping meals warm longer, food in the refrigerator or freezer etc. Reusable and economical With this environmentally friendly silicone lid can be easily cleaned and thus reusable, stretchable silicone lid replaces cling film and aluminum foil, more environmentally friendly. More economy and more convenience.Good sealing & anti-dust The silicone drinking glass lid sticks to the edge of the mug, is dust-tight and sealed. It can stop liquid from spilling even if the mug is tilted. To remove the glass cover, you can simply lift it from the side.