About this item

• Designed to for Stanley 40 oz and 30 oz tumblers perfectly, providing a secure seal for your drinking strawor
• Made from high-quality food-grade silicone material that's durable, flexible, and easy to clean
• Effectively prevents splashes and spills while drinking, making it ideal for use during commutes or outdoor activities
• Simply slides onto 8mm straws and fits snugly into your cup lid, creating a reliable seal in seconds
• Features a thoughtful stopper mechanism that keeps your straw firmly in place while drinking

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