The Rip-Tie Lite Plenum Cable Tie is made from 100% polypropylene and nylon, and is fire retardant, allowing for installation and use in air plenum spaces. This light duty Rip-Tie product comes in your choice of either black or cranberry, and in a spool of 1,440 ties. This bulk option is great if you have a large number of cables and wires to organize.