Right, what I was hinting at when saying "nylon" was precisely that: extruded plastic.
Right, good for bead storage (and also fishing I guess), not necklace-making.
Now, "Frog's eyelash": whoever christianized the product, I deem to be a genius of merchandising, or literature, or both! And I should look for it(*), no doubt.
Thank you, Beadman.

(*Well, a Google search had unexpected results).