lutach are you sure they are not kevlar wrapped on mega usa site I believe they say they are
Yes, they are Kevlar wrapped. Here is what they say it can handle in terms of RPMs, "(e.g. all actual types of AC electric motors MEGA, which have a bandage of kevlar material, can hold 75 000 rpm but also 145 000 rpm without damage!!!)".
I'm pretty sure I said they were Kevlar wrapped somewhere.