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, youll find the bottle nipple that's the perfect fit for your baby's feeding needs. - Wide Neck nipple has a broader profile - Super-soft, made of high-grade silicone - Each nipple level provides a different flow rate - Helps colicky babies settle down/sleep - Reduces colic, spit-up, burping and gas - Helps prevent fluid in the ear/no vacuum - Easy to clean, dishwasher safe - BPA free