Crazepony 2 Pairs Yuneec Propellers 2CW 2CCW Rotor Blade Sets A and B for Q500M Q500+ Q500 4K Keep your Q500,Q500+ or Q500 4K looking and functioning with style using this complete set of rotor blades. Includes sets A and B, resulting in a full set of all 4 propellers Works as a backup,a replacement,or an upgrade Easy to install! More RC racing Quad-copter product is provided by Crazepony in Amazon.Bring your eyes into the sky and racing like a free bird, enjoy the ultimate first person view experience.