The Fiber Optic Cable Marker is designed to visibly identify Fiber Optic cable locations on a wood utility pole. Custom printing and alternative colors are available. Several styles to choose from including hybrid flat rail marker posts, dome marker posts, triview marker posts, test station marker posts, pedestal marker posts and more. When excited by any standard marker locator, the marker ball produces a 5-foot spherical RF. The PM-303 Dome Marker Post is a Cable and Pipeline Marker used as a Warning Sign to mark underground utilities such as: Fiber Optic Cable, Gas Pipelines, Petroleum Pipelines, Electric Lines, Water Lines, Sewer Lines and all other buried utility lines. Flexible Line Markers can also be used as highway delineators, boundary, or trail markers.