I think it's just the nylon hair non crimped. They have crystal now instead of just plain white and man that stuff lights up. I normally use heads like yours and occasionally spray paint them a chrome color. You can also buy heads that look almost identical to an illander head and then tie your own hair onto it. Haven't messed with this too much but I want to start trying. I have also been adding my own mylar to it these past couple of years. You can get that stuff here.
Home "draggin eyes site"
Products "carolina lures site"
Some people like it, but I would suggest getting rid of that excess hair on the inside, no need for it, and depending on the length some think it may affect hook up ratio.