Oh, these buggers have had me salivating on eBay for over a year now.
They seem to be knockoffs, though people on here who've aquired them say the quality is amazing.
I made a montage awhile ago, just for kicks.

The packaging too has been faithfully reproduced, straight down to the original product numbers:

And if I'm not mistaken, the same stamps?

I'm still not quite sure what to make of them.
Surely they MUST be bootlegs, but... wow.
The production value also indicates a labor of love as well.
I haven't looked at them on eBay for at least 6 months, so who knows if they've traveled over into more colors or done any more of the cassette molds.
(Me want! Me want!)