Rolf,
I can spin the floats around and move them back and forth in the workshop easily by myself. Having them suspended on slings from the ceiling makes this very quick and easy.
It's not the weight but their girth, it is too big to get a good enough grip to carry one outside alone. With another person each picking up an end where it is easy to grip carrying them around is no problem. The F85SR has enough volume in the floats to fly 2 of the 3 hulls.
Given the size and volume of the floats they are surprising light.