Các sợi, 250μm, được định vị trong một ống lỏng làm bằng nhựa có mô đun cao.
The tubes are filled with a water-resistant filling compound. A steel wire,
đôi khi được bọc bằng polyetylen (PE) cho cáp có số lượng sợi cao,
locates in the center of core as a metallic strength member. Tubes (and fillers) are
stranded around the strength member into a compact and circular cable core.
The cable core is filled with the filling compound to protect it from water ingress,
over which a thin PE inner sheath is applied. After the PSP is longitudinally applied
over the inner sheath, the cable is completed with a PE outer sheath.