They're "collectable" made by "clackfactory"
There's really nothing at all special about the key itself, it's completely an aesthetic thing..
IMO, the skulls are quite ugly, the other few are ok, but honestly I find them uncreative and merely plays on well established color themes, such as candy corn, gummy/jelly bean colored blue..
Now, the question is...
Should you buy one......
It would seem the keyboard forum is populated by kids and ineffective adults... and some are quite irrational... would I personally make a bet on human stupidity in this case...
No.. not in this case, stupid people are usually poor, which means if you put your money in "clacks" it takes too long for that to turn over. You're better off betting on apple stock, that stuff is solid every new product cycle ever since the iphone..