It has an excellent compatibility with the Stanley Cup: It can perfectly fit Stanley Cups of 30 ounces and 40 ounces. Meanwhile, it has a wide range of compatibility. As long as the size of the tip of the straw is 0.4 inches (that is, 10 millimeters), it can achieve a seamless match. The straw cap has an accurate size, which can not only effectively prevent liquid leakage and overflow, but also is extremely unlikely to fall off during normal use, bringing you a reassuring and convenient using experience. High-quality Material: Our straw toppers are made of food-grade silicone, which is different from ordinary PVC ones. They are free of bisphenol A, odorless, environmentally friendly, soft, durable, and easy to attach to straws. They are suitable for holding both hot and cold beverages. Even with long-term use, they will not emit any unpleasant odors, ensuring the health, safety, and hygiene of you and your family. You can use them with confidence. Reusable & Durable: These products are made of high-quality silicone, which makes them durable, washable, and reusable. They are easy to clean and can be hand-washed or placed in the dishwasher for cleaning. Easy To Carry:These straw caps are lightweight, portable, and very convenient to carry, making them perfect for daily use. They are especially suitable for outdoor activities such as going for a walk, camping, having parties, and other outdoor events. When used at parties, they can add highlights and a unique atmosphere to the party decorations. Brand licensing:Authorized by the co-branding of Mariiearly. The genuine quality is trustworthy.If you have any questions, feel free to consult us. We will actively assist you in solving problems and hope that our efforts will be recognized by you. We are committed to providing you with a satisfactory shopping experience, and your satisfaction is our greatest motivation. This lovely silicone straw cap is jointly developed with the authorization of Mariiearly. This straw cap is made of high-quality silicone material. It is non-toxic and odorless, allowing you to safely hold both hot and cold beverages, and it is very easy to clean. This straw cap can perfectly match Stanley cups of 30 ounces and 40 ounces. It has a wide range of compatibility and can also be easily paired with other straw tips with a diameter of 0.4 inches (that is, 10 millimeters). It can not only effectively prevent liquid leakage and keep dust and debris out, but also add a lot of fun to your daily drinking time. We provide reliable quality assurance and comprehensive after-sales service for this product, so that you can purchase with confidence and use it at ease.