Tony,
They are OEM hooks and I have lost more sleep over them, than anything else I have done all put together. Lets just say its no wonder many of the other folks don't include them. I'm almost to the point of just taking them all off all together

I order one thing, they send me something else. I get what I want and they are not sharp enough or pull out.
But, I think they add a lot of value to the product, so i will continue to plug away at it. Next week, I'll start off with a new supplier for all my current stuff, as well as some cool new stuff.
I will say that gluing the hook is now on my spec sheet
....I forgot to answer the actual question. As far as I can tell its poly cord. It has an outer sleeve with thread strands in the middle. Definetely not kevlar, although that was spec'd for them, I could never get it actually produced.