Bottle Silicone Spill Stopper: Installed in the straw hole of the lid, it not only forms a seal, but also holder the straw and can stop debris and dust from entering through the straw. Silicone leak stopper: These Silicone Spill Proof Stopper are precisely engineered to match the exact dimensions of your favorite tumbler, ensuring a snug and secure fit. Silicone stopper for belly bottle: Made from premium quality silicone rubber, these protective silicone are not only safe, but also reusable. Silicone spill plug: this bottle belly cup spill stopper is made of silicone material, easy to use and install, with strong sealing performance. Leaks stopper: spill stoppers bottle silicone stopper made of silicone, these plugs are not easy to break, can be applied for a lasting time and many times. The spill stopper set is designed to create a effective seal, even when the container is tilted or inverted, preventing liquid from escaping the container. You can now replace your lost vent stopper or replace when worn out as a damaged valve stopper will create poor seal, leading to leakage and lower temperature retention for the tumbler.