Features & Functions:- a) Borosilicate glass b)Easily sterlisable and durable c)Shaped well for good grip d)Nipples made of Hygienic Silicone Rubber e)The unique Air Ventilation System (AVSTM) in the nipples adjusts the air pressure inside the bottle controls the milk flow f)Wide base of the bottle adds stability g)Ideal for the breast-fed baby who needs to be given water or fruit juice