GYTS 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 cable core is FRP or metallic strength member (some structures need add PE as bedding layer in the strength member. Electric wires and tubes (and fillers) are stranded around the strength member into a compact and circular cable core.  The cable core is filled with the ling compound to protect it from water ingress. After two sides psp are longitudinally applied over the innersheath, the cable is completed with PE or LSZH outer sheath.