Poxy Flies

I was given a box of Wigglehead Poxy Flies, and don't know what kind of fly to tie behind the head of them. Anyone out there familiar with these jighead flies?

Thanks, Bill

Do they look like these by any chance?

Yep, just like those pictured. I'm guessing that the fly to be tied behind the head should not be large, so as to allow the head to wiggle?