Abstract: A screen mat having a moulded elastomeric body and at least one elongated tensioning member extending through said body along a path remote from the side edges of the body, the member or members being intended to tension the screen mat in use to restrain flexibility of the body, and in which the body comprises a screen part having substantially parallel upper (screening) and lower (underside) surfaces between which the apertures of the screen communicate and at least one rib which is integral with the screen part and stands proud of one of said surfaces, and wherein the tensioning member or members extend through the body substantially parallel with the surfaces and are located nearer to one of the surfaces than to the other and the rib or ribs are substantially co-extensive with, and overlie, the tensioning member or members substantially over their extent through the body.