Jack, "Poly-band" was marketed by Veniard's quite a few years ago, it was basically a stretched form of a polythene type material that was used for forming bodies & ribs on nymphs & small fry imitations.
There are dozens of assorted filaments on the market, so without a picture it's impossible to tell. Generally "filaments" are used for tails & sometimes the trailing fibres on salmon fly patterns like the Francis fly.
If you post this sort of enquiry in the fly tying section, you will probably get a faster response.
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