These induction sealing liners are easy to use and require an electromagnetic heat sealer for application. Simply place the liner inside the cap, and the heat sealer activates the foil to bond securely to the container's rim. This process ensures a professional-grade seal, suitable for both home and industrial use. Features -Color:Silver -Material:PET,AL,PE -Size:3.20X3.20X0.10cm/1.26X1.26X0.04in -Extended freshness: the high efficiency sealing mechanism keeps contents fresh and extends their shelf life, making it for long term storage -Multiindustry use: suitable for packaging needs in food, cosmetics, pharmaceuticals, and laboratory reagents, providing versatility across various sectors -Leak prevention: ensures a secure seal for plastic, ceramic, and glass bottles and jars, effectively preventing leaks and spills -Automatic electromagnetic sealing: features an automatic sealing design with electromagnetic foil (requires an electromagnetic sealing machine, not included), providing protection -Efficient sealing process: easy to operate, enabling quick and efficient sealing to boost production efficiency Package list: 500 x sealed bottle gasket