There have been many fan attempts to perfect a replica of Wolverine's claws. These, though -- THESE are the real deal.
Adamantium claws are pretty badass. Like, even if you subtracted everything else about Wolverine's character development over the last few decades, he would still be pretty awesome so long as he still had the claws.
So it's not surprising that people have been trying to re-create Wolverine's claws in the real world for a long time. We seen many versions, but these are the first we've seen that can actually snikt! out and then retract.
Really, the only downside to these is that I can't imagine any con letting you in with them. Seriously, they seem incredibly dangerous.