Material of the parts of feeding bottle: Nipple: nipple is made of food-grade liquid silicone rubber, more sanitarian and safer than ordinary silicone rubber nipple Top head:PP,resist temperature up to 100'c available to sterilization Screw cap:PP ,resist temperature up to 100'c available to sterilization Bottle: made of food-grade POLYCARBONATE one-time injection blow moulding bottle is transparent, light weight, smooth inside, easy to wash,tear-resistant and heat-resistant All the products are full-automatic injestion moulding avoiding secondary pollution.Special venthole in the bottom the presure inside and outside the bottle.More healthy, safer,no-toxic and odorless, heat-resistant,tear-resistant Printed with lovely cartoon image,and all printing ink is up to European standard, doesn't contain any heavy metal,no-toxic,safe,hygienic