The lid is made of polystyrene, its thickness is 0.4 mm, the color is white. As agreed with the client, the color can be changed. Lids are packed in strips of 50-60 pieces. There is a valve on the lid that prevents leakage; when you open it, you can insert a straw or drink without it. Also, at the request of the client, the valve can not be cut through and then the lid on an inverted cup will retain the liquid or the product within thee cup.