Abstract: Security elements that are flexible, that can be used for merchandise and preferably can remain on the merchandise, that are difficult to locate, that can be incorporated into the merchandise during its manufacture and that have a simple design, i.e., merchandise security elements that can be economically produced and used. A merchandise security element which is intended for use in connection with acoustomagnetic merchandise security systems formed of a flat section of a swingable metal foil and a flexible, magnetic metal foil which are arranged in an overlapping fashion within a predetermined surface region and which are fixed relative to one another by means of a non-conductive spacer that cannot be magnetized and is arranged in between the two metal foils within the overlapping surface region.