The Perma-Line was designed for permanent placement of a Warning Line System for roof edge fall protection. With this innovative system, you will no longer have to make monthly trips to your rooftop to replace torn or worn out plastic flagging. In addition, you will no longer have to inventory the flagging for future replacements. Once in place, the Perma-Line remains intact until you want to move it. Best of all, it's a non-penetrating system. The Perma-Line (Patent Pending) is the only permanent Warning Line System in the market place. It is not a motion stopping devise. It is a highly visible warning barrier. It exceeds OSHA regulations for warning line systems. Please call us for more details. OSHA has had some recent interpretations on warning line systems. Please visit our OSHA web page for important links regarding the use of warning line systems.