These Stanley cup anti-spill and anti-leak plugs are made of eco-friendly and BPA-free reusable silicone material. They come in a 3-size set to fit different cup sizes and effectively prevent food and drinks from spilling out. With a tight sealing design, you can use them in the office or car with confidence, without worrying about making a mess on your desk or car seat. Furthermore, these anti-spill and anti-leak plugs are easy to clean, simply rinse them with water. You can use them while traveling, enjoying delicious food and drinks without worrying about any spillage or leakage. Finally, these anti-spill and anti-leak plugs are not only practical but also eco-friendly, as they can be reused, reducing the environmental impact of disposable plastics. Whether you use them at the office, home, or on the go, these anti-spill and anti-leak plugs are the ideal choice for a convenient, clean, and eco-friendly lifestyle.