Leak-Proof: Experience the convenience of spill-proof caps that transform standard water bottles into sippy cups, releasing liquid only when suction is applied. Eliminate spills during travel and enjoy greater peace of mind. Universal Compatibility: Designed to fit a variety of standard-size bottles, including water, soda, and beer bottles. These caps are dentist recommended and suitable for all ages, from babies to adults. Ideal for use with reusable straws for an eco-friendly option. Safe and Durable Design: Made from high-quality materials safe for all users. Durable enough to withstand chewing from teething babies and can serve as a soothing teething aid. Helps babies transition from bottles to cups. Portable and Easy to Clean: Compact design fits easily into diaper bags or pockets. A lightweight, space-saving alternative to bulky sippy cups, built to last through travel and daily use. Simple Operation and Maintenance: Easy to use—simply press the cap onto the bottle for a secure seal and open the top to drink. Clean by hand with warm water or place on the top rack of the dishwasher. Begin use by pinching the spout to open. Color: Green Material: Silicone Package Contents: 10 x Bottle top nozzles Note: Light reflection and differences in display screens may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.