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Air-blown micro-cable sets single-mode optical fiber into micro loose tube made of high-modulus polyester material (PBT), and the tube is filled with waterproof compound. The center of the optical cable is made of nonmetal reinforcement, and the micro loose tube (possibly filled with rope) is twisted around the central reinforcement to form a compact circular cable core and the high-performance dry water-blocking material is used in the cable core to block water. Finally, a polyethylene sheath is extruded to form the cable.