Very thin, weak & twisty propellers. Not GWS! 8040DD version in better choice!
You easly damage them when mounting on motor if you are little clumsy. Also very unbalanced, especially 8x4.3R version. You need quite a bit of tape to balance them.
They are good for hovering or normal flying with multicopters, but for aerobatics I prefer stronger ones (APC).
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Ordered two bags of these for my quadcopter. Balanced all blades as best as I could. Flew nicely for about 30 seconds then during a low-stress hover, one blade suddenly broke off. The resulting massive imbalance tore off the engine mount of my fragile HobbyKing V1 frame. Hopeless.
I suspect these are made for slow-fly low-rpm applications, not for multicopters.
Not recommended at all.