CNC-machined from solid 6061 aircraft-grade aluminum Compatible with Phantom 4, For repairing broken Arm for DJI Phantom 4 Yaw Arm Painted silver to match original parts for DJI. Professionally designed and cut using CNC technology with a perfect factory look and feel. The material is 6061 Aluminum that offers extremely light weight with perfect hardness. Saves good money when replace your broken ones and better stock one backup when go out in the field. In the event of another crash, the arm will behave better than the arms for DJI-designed arms, becoming a sacrificial part in order to save the motors, motor shaft, and camera. This is the least expensive repair! Notice:these parts are not original parts,it is duplicate parts,please pay attention.