Enfamil nipples are individually wrapped and ready to use whenever your baby is ready to feed. They are latex free & vented to allow air flow while the baby is sucking. Enfamil nipples fit most bottles with standard or classic size bottle openings, including our Nursette bottles, Enfamil Plastic Bottles, Enfamil GRAD-U-FEED Nursers, Mead Johnson Cleft Lip/Palate Nursers, and Snappies. Features: Nipple Enfamil Premium Slow Flow Tip Infant For use with Nursette bottles Recommended for use with our ready-to-use Nursette bottles Perfect for on-the-go moms May be disinfected in a standard sterilizer