This is a DJI Innovations S800 EVO Part 2 Clockwise Rotation Arm. This arm is a replacement for the S800 EVO, but can also be used as an upgrade for the standard S800 multi-rotor aircraft. The EVO arm features a strengthened structure design with greatly enhanced rigidity. Multistrand SR Wires are used for the power and signal lines and are embedded, which has dramatically improved the system reliability. The S800 ESC and motors can be installed directly onto the arm.