Flooring material comprising board shaped floor elements which are provided with edges, a lower side and a decorative upper surface. A method of producing the zipper tape with high productivity by means of extruding male strips and female strips in rows in a batch is provided. The IDC connectors attach to the conductor. The first and second tiers are connected through a network. The isotope can comprise technetium. A contact guide is provided above the slide to guide positions of upper contact terminals of contacts.