In the box - Propellers (pair) × 2, Screws × 12 Propellers specially made for Mini 4 Pro/Mini 3 Pro produce less noise and have undergone precise dynamic balancing tests to provide higher aerodynamic efficiency and powerful thrust to the aircraft. Follow the instructions and attach propellers to the correct frame arms. When changing propellers, use the propellers in the same package. Do not mix propellers from different packages.