Tightly Sealed — The pressure seals are coated with a torque-activated adhesive for a self-adhesive seal. They bond to glass and plastic jars, as well as round containers with metal or plastic lids and closures and provide an actual seal for different canning jars. Advanced Sealing Technology — These gasket seals do not require induction sealers or shrink tapes. No tools or heat gun required! Just place them in the lid then tighten lid, and let sit for 12 to 24 hours and it’s sealed. Package Includes — You will receive 100 pieces of foam Lid Liners, diameter is about 70mm, thickness is 1.2mm. Please check the bottle mouth size carefully before purchg. Keep Fresh — The pressure sensitive sealing liner provides additional protection compared to basic foam liner. Pressure Sensitive Seals can preserve them longer that ship well and don’t leak with texture of products by providing an tight, leak-proof and water proof seal. 70mm In Diameter — These jar sealers can be used with any type of regular mouth jar, jug, jar, jar or other round neck container made of glass or plastic with external dimensions slightly smaller than the 70mm diameter neck size.