Food Grade Material: Made of food - grade silicone, these straw toppers straw cover are durable, reusable, and easy to clean, either by hand or in the dishwasher. They are airtight, dustproof, and splash - proof, making them suitable for all kinds of outdoor activities. Moreover, they can help encourage you to drink more water. Super Value Set: With 6 straw covers for Stanley in one set, it's more than enough for family use, sharing with friends, or meeting the replacement needs in different scenarios. Wide Compatibility: The straw cover in our 6 - piece set, with a diameter of 10mm (0.4in), is perfectly compatible with the Stanley 40 oz/30 oz tumbler with handle. It also fits all large - diameter long straws with a diameter of 9 - 11mm. Please confirm the size of your straw before purchasing to ensure a proper fit. Cute and Practical: they bring a touch of cheerfulness to your daily routine. These stylishly designed straw covers effectively block dust and fur objects from contaminating your drink, while being entirely harmless to your body. An Ideal Present Selection: With these captivating straw covers, which are perfect accessories for Stanley cups, you can personalize your water cup, eliminating the worry of taking the wrong one. Their small and lightweight design ensures stress - free carrying during outings. This set is truly a wonderful gift option. Surprise your friends and family now! Straw Cover for Stanley