Got these 3 yesterday, and while I think they are most likely contemporary, I figured I would get some opinions to see if I am correct. The smallest one looks to be a divided core swirl (solid core with 4 ribbons around it - the red and blue strands have a very slight space off the core) and the other two look to be ribbon core, although the middle sized one could be a divided ribbon, as I can't quite tell if the is a few gaps in the ribbon or it is a thin strand of a light color.