Packs of 2 Nipples of Silicone NUK for milk. Size 2 (+6 months). It manufactured with high-quality transparent silicone, maintains its form. It forms ortodóntica original NUK, It is adapted perfectly to the oral cavity of the baby. The valve reduces the consumption of air. It developed by the Dr. A. Müller (dentist) and the Prof. W. Balters.