Features: The product is make from silicone materials, which is resistant to highly temperature and wear. And It have good sealing performances, effectively preventing the overflows or leakage of the straw. The straw cover can keep the straw clean and hygienics, prevent dust, foreign objects from entering the straw, and improve the safe of use. The straw cover adopts a simple and compacts designs, which can carried in a portable water cup or childrens water bottle for easy use when go out. Suitable for various cup mouth size. Suitable for daily household drink, such as water cups, coffe cups, etc., providing family member with a healthy and more convenient drinking experience. Suitable for individual who appreciate creative and interesting items. Elevates your drink experience with this unique straw hat designs. Specifications: Materials: Silicone Size Option: 8mm (0.31inch)/10mm (0.39inch) Package Includes: 2Pcs Silicones Straw Cover Caps note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to difference between different monitors, the picture may not reflect the actual color.