These soft silicone spouts are designed to prevent drips and spills! The unique built-in valve of this spout allows liquids to flow out with the sucking action of your child. The spout naturally closes when sucking action ceases, ensuring a leak resistant cup. Since the spout is made from the same soft silicone material as Nûby™ silicone nipples, they help make the transition from bottle to cup easier for your little one. These soft silicone spouts serve as replacement spouts for our No-Spill™ cup. The replacement contains a No-Spill™ Spout, one screw ring and a protective cover (not pictured).