A sealing element for sealing a gap between two components is provided. The sealing arrangement may be a seal arrangement of a gas turbine system, wherein the sealing element is elongate along a main line and has a contoured cross section in a corrugated center region. In cross section, the sealing element is directed along the main line and may be deformed in a direction substantially orthogonally with respect to the main line. In order to provide a wear-resistant, long-lasting sealing element with a particularly efficient blocking action, it is proposed that the seal teeth of the corrugation have a virtually rectangular cross-sectional contour, the tooth height of which seal teeth is between 10% and 40% of the sealing-element thickness which may be measured parallel to the tooth height.