MGXTW cable, the fibers, 250μm, are positioned in a loose tube made of a high modulus plastic.The tubes are filled with a water-resistant filling compound. The tube is wrapped with a layer of PSP longitudinally. Between the PSP and the loose tube water-blocking material is applied to keep the cable compact and watertight. TWO parallel steel wires are placed at the two sides of the steel tape.  The cable is completed with  a ame-retardant sheath.