This magnetic cup lid is designed for YETI 30oz Tumbler, 14oz Mug, 26oz Cup, 30oz Tumbler and 35oz Sippy Cup. (Please note: This cup lid does not fit Rambler Bottle/Jug or Travel Mug with Strong Lid.) Spill-proof Insulation - Black silicone O-ring wraps tightly around the cup to prevent leaks. Thick lid keeps drinks more insulated, cool or warm for most of the day. It prevents spills but is not meant to be stored in a bag, it seals well to prevent splashes if you leave it in the car. Stylish and Practical Design - The tumbler replacement lid features a sturdy double seal design and two strong magnets for smooth and secure opening and closing. No bumping your nose while drinking. The slider is removable for easy washing. Safe to Use - Made of high-quality, shatterproof and BPA-free materials. It remains crystal clear even after years of repeated use. Easy to Clean - Magnets make cleaning easy - pop off the MagSlider, rinse, dry, then put it on the lid. Our replacement lids are cost-effective and function just like the original ones. Plus, you can safely use them in the dishwasher, but avoid using them in the microwave. Note: 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.