Carry four single-mode optical fibers through outside-plant cable routes with the armored construction of Panduit FLSN904. The cable uses 9 µm OS2 fiber, a common single-mode fiber type for optical infrastructure where a link extends beyond a short in-building patching run. Its four-fiber construction provides multiple optical paths in one cable for point-to-point links, paired transmit and receive paths, or reserved capacity within a small backbone route. Armoring distinguishes this cable for pathways where the cable may need more physical protection than an unarmored fiber cable. It fits outdoor and outside-plant runs between buildings, across a campus, or through protected route infrastructure. Plan the cable path, required cable length, splice method, connector type, and termination hardware separately, as these details determine how the cable is deployed at each end of the link. This specific cable combines three defining attributes: 4 fibers, OS2 single-mode construction, and armor for outside-plant use. That combination matters when the installation requires a compact fiber count rather than a higher-count backbone cable, while retaining the optical media and protective construction required for the route. FLSN904 is a cable component for the permanent optical path, not a pre-terminated patch cord or an active network device.