Rip-Tie Fire Retardant WrapStrap is Plenum rated, as it meets the necessary specifications for use in air plenums such as raised floors and air handling ducts. It is manufactured from polypropylene and nylon, and comes in a 75 foot roll that you can cut to your specific needs. This version of the WrapStrap is good for 50 re-fastenings, allowing you to add and remove cables and wires as needed.