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Ropp Cap Seals are specifically made to be used for aluminum caps that are most commonly applied on pharmaceutical bottles for having high durability and strength. They are made of expanded polystyrene and serve as wad liners for roll on pilfer proof caps. These seals are known to assure physical and chemical properties of syrup intact with maintained shelf life. Ropp Cap Seals are easy to apply and admired for enhancing torque application of cap with perfect tightness.