IDEAL INDUSTRIES INC. 31-064 S-Class Fiberglass Fish Tape – 3/16 in. x 200 ft. Non-Conductive Electrical Wire Pulling Tool with Leader & Tuff-Grip Pro Case – Perfect for Electricians, Cable Installation & DIY Home Wiring Projects

We use fish tapes for pulling wire, hose and a variety of other things through pipe and conduit. Fiberglass is by far and away the best. It is non-conductive and more flexible than steel. Don't confuse it with the units sold at Home Depot. They look the same, but the tape is not fiberglass, it is plastic, so it's not nearly as strong and doesn't last as long.