A high security top element assembly for a security wall includes arcuate elements extending outwardly and downwardly from the top of a wall. The arcuate elements extend in both directions from the top of the wall. The arcuate elements terminate outwardly from the wall a sufficient distance to prevent a person climbing the wall from reaching out and contacting the arcuate elements and the arcuate elements are spaced apart a sufficient distance to prevent a person from passing between adjacent elements.