I had seen that this summer. It is pretty cool. I wonder what the frame is made of. Maybe foam board as he holds it in his fingers with a outstretched arm. They said 350 grams I think in the video.
I luv when the demonstrator gives it a knock or a push and it stubbornly flies back into position {LOL} [glow=maroon,2,300]w00d[/glow]