Seal complex which can be inserted between two annular members in relative rotation, especially between the inner and outer ring of a roller bearing, in which a sealing screen comprising an annular elastomer member and a rigid reinforcement at least partly embedded therein is fitted to an annular seat of the first member and acts slidably together with a radially step-shaped sealing annular seat on the second member with its own highly flexible radial portion being without reinforcement and softened, ending in an annular sealing rib; a lateral face of the stepped seat having radial extension is bounded by a tapering surface having a radial axis and tapering in the direction of the first member by an amount such that in all circumstances it acts together through interference with the sealing rib in the flexible portion of the screen.