thinkbaby Set of Two Slow Flow Nipples - thinkbaby's Cross Cut (Slow Flow) Nipple has been specifically designed to reduce the incidence of colic (gas and spit up).  Slow flow Nipple Designed to reduce nipple collapse during usage Patented Anti-Colic device built into nipple Made from Silicone Packaged in recycled materials Two nipples per package Cross cut design helps reduce the chance of spillage during use