These blades have imperfections.
I would not recommend for Hard 3D,
Fine for Novice and Sport flying styles
Radix have a couple of marks (arrows in pic's)
They were two single blades that I balanced out.
Edge's were repaired when I repaired other blades I have kept.
I have been repairing blades for about 5 years, and have not had a failure. If it is a unsafe blade, it never makes it to the repair pile.
With my flying style, after the repairs I made, I made a decision that I fly too hard to keep these.
These are fine for a newbie who is just learning, and not pushing the blades, sport flyer.I would not sell them if they were unsafe.
I would not recommend for any type of 3D flying
Fly with scheduled ground contact !