High quality optical leads for digital audio interconnections. The TOS type plugs have an attractive gold finish and gold plated inner pins. TOS to TOS usually is used to connect DVD Players to HiFi s (necessary sockets are required) plus some X-Boxes PC s and audio equipment have TOS sockets. Able to deliver digital 5.1 surround sound at the speed of light with very low loss in one cable. Thick 6mm cable for less loss and better quality.