The sealing disk is meticulously crafted in Italy for a perfect fit with the Natursutten® glass baby bottle. Simply place the sealing disk inside the white Natursutten® ring/thread for a secure seal. Made from safe, high-quality PP (polypropylene), it is free from harmful chemicals and complies with strict European safety and quality standards, including EN14350 and CPSIA. Each pack includes two sealing disks. Product ID: 20023 UPC: 894654002158