Made of 100% safe hygienic medical grade silicone, Tiny Twinkle silicone nipples are created for comfort, providing a natural feeding experience for babies. Double anti-colic vents helps prevent baby from swallowing too much air. Flex and stretch nipple and soft natural shape of the silicone help mimic the natural feel of breastfeeding. Safe for use with dishwashers, steam sterilizers, boiling water and microwaves. Available in 3 sizes: Slow Flow (0-3m), Medium Flow(3-6m) and Fast Flow(6-9m). Manufacturer SKU: NP2-1 ; NP2-2; NP2-3