Features: • With orthodontic silicone bottle teat size M (medium-sized hole) for baby formula • With nuk Anti-Colic AIR SYSTEM to help prevent baby colic • Bottle made from high-quality polypropylene plastic (PP) free from harmful substances ultra light, highly robust and even suitable for freezing • Including protective cap, blind covers and threaded ring • Soft silicone • BPA-free NUK Bottles NUK offers baby bottles made out of the synthetic materials polypropylene (PP). They are particularly light and nearly unbreakable and with that, optimally-suited for use both at home and out and about. Bottles made from polypropylene have a milky transparency, are particularly sturdy and can even be used for freezing food.. NUK Baby Bottles are well suited to being boiled and sterilised with steam. Its smooth surface ensures that it is pleasant to touch. It is notably shatterproof and is even suitable for freezing.However, plastic is neither as heat-resistant as glass and nor as scratchproof. When the bottles are scratched inside, you should replace them, as germs can settle in the scratches more easily.