Standard 8-figure self-supporting laminate fiber optic cables are constructed by placing single - or multimode fibers in a loose tube made of high modulus plastic, which is filled with a water-blocking compound. At the center of the cable core is a metal reinforcement core. For some fiber optic cables with a number of cores, a layer of polyethylene should be squeezed outside the metal reinforcement core, and the loose sleeve (and filling rope) should be twisted around the central reinforcement core to form a compact and circular cable core. The gaps in the cable core should be filled with water-blocking filler. The cable core is longitudinally wrapped with steel-plastic composite tape, which is placed parallel with the steel strand and extruded with 8-figure sheath to form the cable.