Pigeon Glass Nurser K-4 empower baby’s characteristic tongue development. The container is produced using premium borosilicate glass material with superb straightforwardness and high warmth obstruction. It is strong, durable bottle and of great help to new mothers as it makes feeding time as easy as possible. They are designed in such a way to make feeding easy for the mothers as well as the child. PIGEON’s Glass Baby Feeding Bottle (Slim Neck) Clear Cap is made from premium quality borosilicate glass material that is BPA-free, heat resistant, transparent and safe for babies. The soft and stretchable nipple is made with 100% silicone and assists the peristaltic movement of the baby’s tongue while sucking. The clear cap will make feeding your baby a happy and comfortable experience for you and makes sure that that the milk is flowing in a smooth manner. It is designed specifically to facilitate the baby’s natural sucking motion.