a method of fitting a generally cylindrical corrosion protective and / or aesthetic sheath on a cable , which method includes the steps of fitting a sheath unit on one end of a cable ; shifting the position of the fitted sheath unit toward the other end of the cable ; fitting a fresh sheath unit similarly on the cable in continuation from the preceding sheath unit ; and repeating the fitting of a fresh sheath unit and the shift of the preceding sheath until the cable is covered with the sheath units substantially over the entire length thereof .