This is a set of Pigeon slim-type baby bottles, 120ml and 240ml. They are made of glass. Since I was exclusively formula-feeding, I bought five bottles and used them in rotation only during the initial newborn period. I used these for about a month, during the newborn stage, before switching to other bottles. They have been washed and sterilized, but please sterilize them again before use. - Brand: Pigeon - Size: 120ml, 240ml - Material: Glass - Features: Graduated measurements Thank you for looking.