The CB6318 GDTA cable is a hybrid cable that brings together electrical conductors and optical fibers into a single efficient network installation solution. The optical fibers are contained in waterproof loose tubes with high modulus, filled with water-blocking gel to protect the fibers. In the center of cable is a metallic strength member. The tubes and copper wires (of required specifications) are stranded around the central strength member to form a. Located in Ningbo, the main seaport city in China, Ningbo Haishu Efon Communication Limited is a professional manufacturer of fiber optic cables.