Made in Connecticut.
What distinguishes them? Honestly I couldn't tell you. I don't make cleaning magnets and I don't know why they work better. But I've used the Tunze care magnet, the Flipper with the acrylic blade, multiple handheld tools, credit card scrapers, Magic Erasers and more. It cleaned better than all of them (wasn't even close), it was easier to use, and it scratched much less than the others.
If I had to speculate, I would guess that the clamping strength of the magnet they use is greater, allowing for better pressure on algae and thus greater cleaning power. I'd also say that the design of the cleaner puts more surface area against the tank wall, cleaning more with each pass while reducing the pressure at any one spot to avoid putting scratches into the acrylic.
Like I said - I don't actually know why they are better. But based on my actual experience using them vs. other products, they empirically are.