Has anyone seen or handled these before, or know anything about them, they look kind of neat, and the face cards look like they could be pretty cool. A shame it looks like the white ones aren't actually available anymore.
If they're like the black deck I got from Rajas Paranjpe, they're made of black PVC plastic. Good enough for shuffles and card games, but I don't recommend them for fanning. Might be able to use them for complex cuts.
Aside from the "Keep Calm and Carry On" deck, all the decks that site offers are made of PVC plastic.