Advantage: The pressure-sensitive seal which is made of polystyrene foam material effectively avoids dust, moisture and dirt into the jar and prevents leaks and odors in the bottle so that it can keep the dry or powder products fresh at all times. Instruction: 1. Keep the cap where the seal needs to be attached clean, make sure there are no water spots and oily residues.; 2. Put the lettering side of the seal into the cap and apply a little pressure to attach it tightly; 3. Finally, Screw the lid on as tightly as you possibly can, and let the container sit for at least 24 hours to ensure proper adhesion. Application: The foam lid liners are not only easy to install but can also be used for containers of different materials, such as glass bottles, plastic bottles, metal bottles and various jars. NOTE: 1. Please make sure the right size you need before ordering, manual measurement allows 1 to 2 mm of error. 2. These pressure-sensitive liners are best used with powder or dry products; Avoid overfilling the container. 3. It is recommended to wait enough time before removing the cover after installation. 4. These PS foams are not suitable for use at high temperatures.