DJI F550 frames are built from very strong materials. The arms are made from the ultra strong PA66+30GF material which provides better resistance to damage on hard landings, while the main frame plates use a high strength compound PCB material. This makes wiring the ESCs and battery easier and safer on the lower of the two frame plates, this is also the distribution board.
The overall frame design provides enough space when assembled to fit an autopilot system between the top and bottom plates on theFlamewheel. The arms supplied in the kit are different colours, 2 red and 4 white to allow for improved visual orientation in flight.