Coaxial cables are usually found in some parts of Asia to transmit signals from a cable TV provider to your home. But this one is much thinner than that. A team of researchers have developed a wire only 300-nanometers wide that we can say is much thinner than the width of human hair to transmit visible portion of light. The cable has an inner copper wire that is surrounded by an insulator and then an outer wire of aluminum. The setup allows visible light to pass through it. The wire can be used in high efficiency solar energy cells. But the main use of the wires is in the field of medical science as the wires are so thin that they can easily be used for retinal implants. The availability is not yet decided by the researchers but if we see the size and the possibilities of applications we can say that the wires will find a very good market on their release.