Food Grade Material: Made of silicone, these silicone straw covers are durable, reusable, and can be cleaned by hand or in the dishwasher. Not only can it be decorated but also can increase children's habit of drinking more water. It is airtight and sealed, dustproof and splashproof, especially suitable for outdoor activities. 10mm Straw Covers: compatible with Stanley 40 OZ tumbler straw and most straws in diameter 0.4 inch(10mm).The perfect gift for friends and family. Stylish and practical: This straw topper not only looks cute, but is also practical.It can effectively block dust and other foreign objects from entering, a straw stopper that can be used permanently without harming your body, and it's also very cute, you deserve to have it. Portable Straw Lid Kit: Small shape, you can carry and use it anywhere, suitable for various outdoor activities, such as walking on the street, camping, hiking or other activities, and you can also give them as beautiful gifts to relatives and friends. Great Stanley Cup Accessories: Great novel gifts! Great for your friends or family Compatible with Stanley 10 mm straws for easy use Creative cartoon shape adds a cute and decorative touch Perfect for home, office, and outdoor activities to keep dust out of drinks Food-grade silicone material ensures durability and safety Reusable and easy to clean, hand washable and dishwasher safe