Leak-Proof : Experience the convenience of spill-proof caps, transforming standard water bottles into sippy cups that release liquid only when sucked on. Say goodbye to travel spills and hello to peace of mind. Universal Compatibility: to fit a variety of standard size bottles, including water, soda, and even beer bottles, caps are dentist recommended and perfect for everyone from babies to adults. Use them with reusable straws for an eco-friendly option. Safe and Design: these caps are safe for all users. They're enough to withstand the bites of teething babies and can even as a soothing teething toy, while also helping babies learn to transition from bottles to cups. Portable and Easy to Clean: caps are and compact, fitting easily into any diaper bag or pocket. They're a hassle-free alternative to bulky sippy cups, built to last through all your travels and adventures. Simple Operation and Maintenance: Using is a breeze-just push the cap onto the bottle for a tight seal and open the top. Cleaning is equally simple: hand wash with warm water or place it on the top rack of the dishwasher for a convenient and thorough clean. Start using by simply pinching the spout. Colour:Blue Material:Silicone Package Contents: 10 * Bottle top nozzle Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.