What kind of material is the ribbon raped around??
Thanks Boss
It’s wrapped around flexible mica insulation sheets. It’s much easier to work with instead of actual mica, like the original heaters. This stuff seems to be like a paper made from ground up mica.
Interesting and good to know that the heaters can still be made
It might also help that the new mica hasn't had 80-90 years of abuse 
I’m no longer afraid to buy an Empire product with a bad heater. I’ve even designed in my head a replacement heater for the Jensen blanket heaters, should the day come that they are no longer available.