Made of super-soft, high-grade silicone, each nipple level provides a different flow rate. All of these bottle nipples vary in size and shape. From the Preemie Flow nipple, which limits the flow to tiny mouths to the Y-Cut nipple which literally utilizes a “Y”-shaped opening to allow for greater milk flow, you’ll find the bottle nipple that’s the perfect fit for your baby’s feeding needs. Features Wide-Neck nipple has a broader profile Super-soft, made of high-grade silicone Each nipple level provides a different flow rate