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Perfect Compatibility - Our straw toppers are specially designed to fit 0.4in straws in Stanley cup 30 40oz tumblers. They provide a secure seal, making them ideal accessories for stanley and simple modern water bottlesCute and Fun Designs - The unique straw cap adds a playful touch to tumbler, making hydration more fun, especially for kids, helping to encourage them to stay hydrated while keeping their drinks stylishDust-Proof Seal Protection - Our straw covers effectively prevent dust, flies, and other splashes from entering your drink. They’re perfect for outdoor activities like hiking and camping, providing reliable protection for your favorite StanleyPerfect Gift for Cup Lovers - Straw cover great gift for anyone with Stanley or similar-sized cups. With their cute,functional design, they're perfect for birthdays, holidays, and just adding a smile to your everyday hydration routineSilicone Material - Made from BPA-free, these straw covers cap are safe for kids and adults. durable and reusable, they are perfect for adults and kids, making hydration easy, clean and safe