Structure: 4~12 fibers & 0.6 full chromatogram tight-buffer optic fiber(supply various optic fiber, such as SM, MM<50/125, 62.5/125>OM2, OM3, G.655 and etc. )+stainless steel flexible tube +water-resistant belt + Kevlar + stainless steel braiding (increase twist-resistance and avoid exterior destroy to optic fiber) + sheath( various material for choosing ).