A flat seal, assembly comprises at least one metallic layer, which is to be supplied with several passages, spaced by bridges, whereby at least one corrugation and/or at least one wavelike contouring is to be set out at least in the area of one of the layers, on the passage side and at least for part of the area. The profile surrounding the pertaining passage has an approximately constant cross-section and a different profile is provided for the area of the pertaining bridge at a specified circumferential angle (α) to increase compression in this area.