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These are very nice, very rigid like a carbon mix blade but not as brittle.Please whatever you do, do not get these props. I have struggled with my multirotor for months trying to fine tune it and get the right flying characteristics, tried everything except changing the props. Finally broke enough to get some new ones and wow. Night and day difference. Stay away from these at all costs, I recommend something like the APC mr propellers.Yeah I'll agree with the others, these props blow... errr, suck... well, they are just plain bad. I bought a few sets because they were available at the time, and put them on a newly built quad copter. I balanced the props pretty well but still had stability problems from hell even though I was using a Naza controller. Since it was a new frame, I debugged everything (except for the propellers). I finally broke enough propellers that I bought some Turnigy props that were finally in stock. Surprise, with the Turnigy props everything works beautifully.Why did you sell them? Would have written that they are not what is intended to be installed on the existing model.