Silicone seals for water bottles (10 pieces)Contents: 10 pieces The seal is made of high-quality silicone, is manufactured in Germany, and looks like a small O-ring. Features:Free of BPA and plasticizersEasy to insert into the lid’s sealing rimCompatible with standard lidsQuick and easy to replaceDimensions:Inner: 3.8 cmOutside: 4.5 cm