The Philips AVENT BPA Free Natural Fast Flow Nipples are designed to promote natural latch-on and make it easier for baby to combine with breastfeeding. The innovative twin-valve system is made of soft, durable silicone, which is odorless and flavorless. The nipples are dishwasher safe and compatible with all Philips AVENT Natural bottles. The Philips AVENT BPA Free Natural Fast Flow Nipples feature a soft, flexible, wide-shaped nipple that is easy for baby to latch onto. The advanced anti-colic system with innovative twin-valve prevents air from entering baby's tummy, which can cause colic. The made of soft, durable silicone, which is odorless and flavorless, nipples are dishwasher safe and compatible with all Philips AVENT Natural bottles. The Philips AVENT BPA Free Natural Fast Flow Nipples are a great choice for parents who are looking for a way to make it easier for their baby to latch on and breastfeed. The advanced anti-colic system with innovative twin-valve prevents air from entering baby's tummy, which can cause colic. The nipples are made of soft, durable silicone, which is odorless and flavorless, and are dishwasher safe and compatible with all Philips AVENT Natural bottles.