These are horrible,
This review is from: GoPro DJI Phantom 2, Phantom 2 Vision, Phantom 2 Vision+ 9" Propeller Bumper Prop Protective Guard 4 Pcs - Red and White (Toy)
They are made of a weaker and more malleable plastic. than the true DJI rotor guards.
I would not recommend them.
I think that they are useless.