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.
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.
Thanks, I'm mainly looking for Black/Purple hair right now.
Here's a chin weight for swimming Ballyhoo that works well for me that you might try, not as bulky as an egg sinker, tucks in nicely between the gill flaps.
I've never seen 'No Roll Sinkers' for sale, 10+ yrs ago I was ordering an egg sinker mould,
saw that mould and knew it should work like a sailboat keel.