• All of our silicone cup lids are made of food grade silicone. They are small, durable and reusable. Simply wash with your hands or throw them into the dishwasher. • Diameter 4.25 inches; Suitable for all types of cups with a diameter of less than 3.9 inches. TEMPERATURE: -40~480 F. Can be used in refrigerator and microwave. • Seals tight on all smooth rims like cups, mugs and glasses. They prevent dust or dirt, airtight and leak proof. Keeping your coffee or tea hot for longer time. • Perfect for party and family use, each style selection comes in packs of 4. • Props in photos are not included.