Feature: 1. Anti Spill: The silicone leak stoppers prevents drinks from spilling out of the straw and prevents dirt from entering, keeping the straw clean. 2. Stopper Function: The square stoppers form a seal and holds the straw in place, the round leak proof stopper with an open design ensures that air can enter when drinking. 3. Safe Material: Stoppers are made of safe silicone, durable and reusable, heat resistance, environmentally friendly for long term use without deformation. 4. Practical Design: Spill proof stoppers are compact, lightweight, easy to install and portable, perfect for outdoor activities, bringing you more convenience in life. 5. Daily Using: The upgraded design is suitable for most cups and bottles, and is a must have item for your travel with water cups. Specification: Item Type: Cup Spill Proof StopperMaterial: Silicone . Package List: 2 x Straw Cover Cap2 x Square Spill Stoppers 2 x Round Spill Stoppers