Phosphatized steel wire is a common material used for the reinforcement of optical fiber cables. It provides strength and durability to the cable, allowing it to withstand tension and other stresses that it may encounter during installation and use. Heat-shrinkable cable is a type of cable that can be shrunk to fit snugly around the cable it is protecting. This type of cable is often used in applications where space is limited or where the cable needs to be protected from moisture, dust, or other contaminants. When phosphatized steel wire is used in the reinforcement of heat-shrinkable cable, it helps to ensure that the cable remains strong and secure even after it has been shrunk down to a smaller size.