The Round Wide Neck Teat From Nip Is Made Of Food Contact Silicone. The Integrated Anti-Colic Vent Prevents Air From Being Swallowed, Thus Reducing The Risk Of Infant Colics And The Actiflex-System Prevents The Teat From Closing Up, Thus Ensuring An Even Flow During Feeding. The Extra Thick And Perfect-Fit Flange Ensures Optimum Non-Drip Fit On The Bottle Neck. The Teats Are Available In One Universal Size With Teat Hole S (For Tea Or Breast Milk), M (Milk Powder Food) And L (Thick Liquids). The Teat Fits On All Nip Wide Neck Bottles. To Guarantee A Constant Quality, Our Nip Teat Is Produced In Germany. From Families For Families.