Versatile Accessory: Silicone straw cover cap compatible with Stanley 40oz and 30oz tumblers, providing a cute and protective lid for your reusable straws. Secure Fit: Designed with a 10mm diameter to snugly fit most reusable straws, preventing spills and keeping your beverage secure. Stylish Design: Featuring an adorable red bow detail, this straw cover adds a touch of fun and personality to your drinkware. Easy to Use: Simply slide the silicone cap over your straw for a leak-proof seal when not in use. Reusable and Durable: Made from high-quality, food-grade silicone, this straw cover is built to last and can be easily cleaned for repeated use. Elevate your Stanley tumbler experience with this adorable Red Bow Straw Cover! This silicone straw cover cap is designed to fit perfectly on 40 & 30 oz Stanley cups, adding a touch of cuteness and convenience to your beverage sipping. The 10mm diameter ensures a snug fit over most reusable straws, keeping your straw securely in place and preventing spills. This straw topper not only looks charming but also acts as a stopper for your reusable straws when not in use. With its vibrant red bow design, this straw cover for Stanley cups is sure to brighten up your day and make your tumbler stand out. Upgrade your Stanley cup accessories with this cute and functional straw cap stopper today!