They is that nifty black kevlar cable that is super strong. Good enough for 35% planes.

That formula kind of sounds like my fishing formula. I multiply the weight of the fish I hope to catch and apply it to the # test I am going to use. Last fishing trip I was catching a lot of channel cat on a fly rod. I tried explaining the concept of wearing out the fish to my little cousin, but that round went to the cat.

Come to think of it, maybe I should use that kevlar cable for fishing