This are Arm Guards for your GEPRC KHX/KX Series Frames.
It is designed to snap one the end of the Arms. No need for screws here. You have to cut the rear part on the top, so the Arm can go through (like in the Pictures!)
One of these weighs under 3 gramms so with just 12 gramms extra, you can protect your quad from a lot of damage.
You shloud use 2 Wall Lines to get the perfect fit and 100% Infill (or what ever you want..it will not change much).
I did not have this in the air now so I don't know how this performs in the air.
If there is anything you have to improve, hit me up!!