It is recommended that you replace the liner every three months to keep your cup in the best possible condition. The replacement seal helps effectively prevent leaks, so you no longer have to worry about spills or messes. Keep your favorite mug with you at all times. Water bottle gasket replacements can deform or wear out over time, resulting in loosening. Our lid replacement seals are designed to create a secure seal between the lid and the cup, keeping it clean and leak-free. The replacement lid is made of high-quality silicone, safe, BPA-free, and easy to cleanan essential for everyday use! Simply use your fingers to remove the old seal and slide on the new one. Easy to install and restores your cups like-new performance. Color: Transparent Material: Silicone Package Contents: 4 x Rubber Lid Seals Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the real thing. Measurement error allowed is +/- 1-3 cm.