After I heard that 2013 Topps Chrome included black parallels numbered to 100, I could only imagine how awesome the Pirates cards would look, and I had to put a team set together. They did not disappoint. I was able to snag each of these off of eBay for decent prices. They're rare enough to have some value, but not so rare that they're unobtainable.
Sometimes parallels can look very odd. When the border colors match the team colors, it just looks amazing.