A card fabricated of a flexible material such as paper, pasteboard, plastic and the like that has a first planar surface and a second planar surface. The card is formed with a line of perforations or a fold line dividing the card into first and second sections and a thin, flexible, magnetic sheet material...http://www.google.es/patents/US5458282?utm_source=gb-gplus-sharePatente US5458282 - Card having magnetic sheet secured to one surface
