Anti-Colic: Features an advanced 360° anti-colic system that relieves air pressure to prevent gas so baby is fed and happy. 5 Different Flow Rates: Preemie, Slow Flow, Medium Flow, Fast Flow, and Y Cut. Good for every stage of development from preemie to infanthood. Extra Soft & Familiar: Designed with a mom-like shape and natural feel that helps baby easily latch to the nipple. They help prevent nipple confusion and are perfect for babies transitioning from breastfeeding to bottle feeding. Baby-Safe, Non-Toxic: Made from the food grade silicone to protect from latex allergens and are 100% BPA-free. Durable & Easy to Clean: Leak-free and dishwasher safe design (top rack only). Official Nanobébé Product: Exclusively for Nanobébé Breastmilk Bottle and Flexy Silicone Bottles. Nanobébé's Silicone Baby Bottle Nipples come in 5 different flow rates available to accommodate every stage of your little one's bottle-feeding journey. They’re soft as skin and shaped like mom to prevent nipple confusion, and they provide an easy and seamless transition between breast and bottle that feels natural for your baby. Each triple-vented nipple pack contains 2 Silicone Nipples. Nipple Size Guide: P = Preemie 1 = Slow Flow 2 = Medium Flow 3 = Fast Flow Y = Y-Cut