Make of silicone, this cup lid is designed to bear long term use without deformation Its flexibility ensures suitable for most cup sizes Perfect for homes, offices and especially good as a camping cup lid to keep something out of your drink Whether it is hot coffee, soup, or iced teas, our silicone coffee cup lid help maintain the temperature, freshs, and flavor of your cups content Features a builted in slot to hold tea bag strings securely, avoiding it from slipping into your drink Provides a grip and acts as a heat barrier for hot cups