Natural and suitable for the jaw, especially soft silicone nipple With anti-colic air escape system NUK Anti-Colic Air System, which ensures the natural flow of liquid Clinically tested for the ideal combination of breastfeeding and bottle use Made of high quality durable polypropylene (PP) Free of bisphenol A (BPA) The users who have bought it stand out mainly because they have good quality materials and it is light.