Not much in the way of metal in this other than the screws that will attach the hardware.
Now, when I say weather resistant I am not talking about rain. I am talking about heat (desert), UV resistance (desert), cold, rain, ice, longevity, etc.
Heat, UV, and COL. We are all familiar with bungee cords. I'm looking at the ultimate material for bungee cords. Not the cheapest or most economical.