Bottle made of Polypropylene, BPA Free and Food Contact Grade. Can be sterilized up to 110C. This easy to grip design bottle uses a Peristaltic Slim Neck Nipple. - Bottle made of Polypropylene - Nipple Type : Slim Neck Peristaltic - Nipple Size : S - Size 120 ml - AVS (Air Ventilation System) which functions to facilitate air circulation from the baby's suction so as to prevent the baby from becoming bloated