These Pura teats are designed to mimic the variable flow of milk emission typical of breastfeeding. They have a particular shape that favors sucking and a firm grip between the baby's mouth and the teat: by also preventing the entry of air, they reduce the possibility that babies may suffer from colic. They have no plastic components (therefore they do not release toxins), they are made of 100% medical silicone, a feature that makes them the safest teats in the world. This model, with a Y cut for thicker liquids and for faster emission, is recommended from 6 months and up, and there are 2 teats in each pack.