"SPECIFICS OF TENY UNIWHEEL WHILE RIDING, SPINS EXTREMELY SMOOTHLY, REDUCES PHYSICAL VIGOR DEFINITELY, DECREASES VOLUME OF WIND RESISTENCE, REINFORCES RIDING SPEED, RAISES WHEEL TOUGHNESS, THUS FEEL SAFE, CHEERFUL & COMFORTABLE.
Yes, the rear wheel seems to have an axle for 120mm rear, track nuts and the flipflop hub has proper reverse lockring threads and all. Only available in 26" size, though.
Buy them here, if you absolutely have to...
Thanks to NKOTB for bringing these beauties to my attention.