Enhanced Seal Performance: Our silicone gasket seals ensure a tight, leak-proof fit, even when subjected to vigorous shaking or tilting, surpassing standard seal quality for worry-free use. Premium Food-Safe Material: Crafted from high-quality silicone free of BPA and harmful substances, these durable seals guarantee safe and reliable performance, ideal for maintaining the integrity of your beverages. Effortless Replacement: Enjoy hassle-free maintenance with our easy-to-install seals that require no additional tools, saving you time and effort while ensuring a snug and secure fit every time. Versatile Compatibility: Designed for 16-ounce or 20-ounce water bottles, these replacement seals offer a universal fit, making them suitable for various bottle sizes and brands for added convenience. Hygienic Lid Maintenance: Regularly replacing the gasket seals not only enhances the seal's effectiveness but also helps keep your bottle lid clean and free from residue buildup, promoting optimal clean. Item Name: Water Bottle Seal Material: Silicone Purpose: Dust-proof Sealing Applicable Water Cups: 16oz And 20oz Travel Cups Features: Leak-proof, Food Grade, Cup Accessories Size Details: Inner Diameter: 6cm/2.36" (Approx.) Outer Diameter: 6.7cm/2.64" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 4 x Water Bottle Seals