Dji F550 Flame Wheel Arf Kit Ultrastrength Material Frame Arms adopt PA66+30GF ultrastrength material design, providing better crashworthiness Attractive Frame Arms Provide different color frame arms: red, white, black, which makes your flight more colorful. Integrated PCB Wiring The use of high strength compound PCB frame board, makes wiring of ESCs and battery safer and easier Huge Assembly Space Optimized frame design, which provides abundant assembly space for autopilot systems.