The present invention relates to composite metallic ultrafine particles which have excellent dispersion stability and can be produced on an industrial scale, and a process for producing the same, and a method and an apparatus for forming an interconnection with use of the same. The first card connector includes a plurality of first terminals with a vertical portion. One form of the radio frequency identification device is an identification wristband which incorporates attachment means and securement means for said attachment means, the securement means incorporating an RFID such as a chip which is removed from operative relationship with the attachment means when the securement means is removed to permit reuse of the securement means and chip. The method further includes displaying a third menu containing at least one drug menu item. The serrated surface is processed such that the teeth are removed from selected surfaces of the serrated surface and that the remaining teeth form a perforation pattern.