The Pacifier Teat Is Made Of 100% Natural Rubber Latex, Which Is Soft And Flexible. It Has A Vent That Lets Air In To Make The Nipple Shape As Natural As Possible. Due To The Natural Material, Color And Transparency May Vary - Do Not Forget To Change The Pacifiers Every 4-6 Weeks Of Normal Use! The Panel Is Convex, So The Air Flow Ventilates The Baby'S Sensitive Skin Around The Mouth And Cheeks. The Panel Is Made Of Polypropylene (Pp), A Very Light, Highly Resistant Plastic Material, And Is Highly Abrasion Resistant.