This bundle includes Dr. Brown's silicone baby bottle handles and Dr. Brown's medium flow silicone nipples to help your baby transition to independent drinking. The 3-pack of lightweight, easy-grip handles fit all Dr. Brown's wide-neck bottles. They are made of flexible, BPA-free silicone that is safe to clean in the dishwasher, sterilizer, or boiling water. The handles encourage your 4+ month old baby to grasp their familiar bottle independently as a first step before transitioning to a cup. The 2-pack of Dr. Brown's level 2, medium flow silicone nipples are designed for 3+ month old babies. The nipples feature an anti-colic internal vent system clinically proven to reduce colic, spit-up, burping and gas. The breast-like nipple shape provides a natural latch and comfortable, consistent vacuum-free flow so babies can feed at their own pace. The nipples are also made of 100% silicone, fit all Dr. Brown's wide-neck bottles, and are safe for sterilizers and dishwashers. Together, these components complement each other to provide a complete system focused on your growing baby's transition to independent feeding using familiar Dr. Brown's bottles with the added benefit of handles for grasping and medium flow nipples for an appropriate flow rate.