A blind slat having a substantially constant cross-sectional profile extending between a leading end and a trailing end, said profile defining an upper face of said slat, said upper face having: a convex portion extending from adjacent said leading end towards said trailing end, said convex portion having an apex at which said upper face is parallel to a reference axis of said profile extending laterally between said leading end and said trailing end; a concave portion located between said convex portion and said trailing end, said concave portion having a base at which said upper face is parallel to said reference axis; an inflection joining said convex portion and said concave portion, said upper face being inclined with respect to said reference axis by at least 11° at said inflection; and a secondary convex portion defined between said concave portion and said trailing end; characterized in that said profile has a depth measured between said leading end and said trailing end of between 105 and 150 mm: and in that said profile further defines: a leading rolled portion extending between said convex portion and said leading end, said leading rolled portion defining an open substantially cylindrical cavity for receipt of a leading tape clip; and a trailing rolled portion extending between said secondary convex portion and said trailing end, said trailing rolled portion defining a further substantially cylindrical cavity for receipt of a trailing tape clip. a convex portion extending from adjacent said leading end towards said trailing end, said convex portion having an apex at which said upper face is parallel to a reference axis of said profile extending laterally between said leading end and said trailing end; a concave portion located between said convex portion and said trailing end, said concave portion having a base at which said upper face is parallel to said reference axis; an inflection joining said convex portion and said concave portion, said upper face being inclined with respect to said reference axis by at least 11° at said inflection; and a secondary convex portion defined between said concave portion and said trailing end; characterized in that said profile has a depth measured between said leading end and said trailing end of between 105 and 150 mm: and in that said profile further defines: a leading rolled portion extending between said convex portion and said leading end, said leading rolled portion defining an open substantially cylindrical cavity for receipt of a leading tape clip; and a trailing rolled portion extending between said secondary convex portion and said trailing end, said trailing rolled portion defining a further substantially cylindrical cavity for receipt of a trailing tape clip. and in that said profile further defines: a leading rolled portion extending between said convex portion and said leading end, said leading rolled portion defining an open substantially cylindrical cavity for receipt of a leading tape clip; and a trailing rolled portion extending between said secondary convex portion and said trailing end, said trailing rolled portion defining a further substantially cylindrical cavity for receipt of a trailing tape clip. a leading rolled portion extending between said convex portion and said leading end, said leading rolled portion defining an open substantially cylindrical cavity for receipt of a leading tape clip; and a trailing rolled portion extending between said secondary convex portion and said trailing end, said trailing rolled portion defining a further substantially cylindrical cavity for receipt of a trailing tape clip.