Features: Four force arms are craft from nylon and carbon fibered rod, each arm is reinforced with a whole carbon fibered rod. Adopting integrated Printed Circuit Board wiring and equipped with strengthen 5um composite Printed Circuit Board, electrical adjustment and other wiring faster and safe. Equipped with gimbals mount, the boom adopts inward and lateral inclination design, which can make the aircraft more stable in roll and pitches directions and flexible in rotate. The new design is lowered the installation position of the motor and raised the Printed Circuit Board position, making the center of gravities of the new four axis aircraft lower and more stable. 500mm Wheelbases rack, suitable carrying gimbals for , entertainment grade flight photography, and practice machine option. Optimization the design to provide ample installation space for various flight controlled system. Using non-standard M2.5 hexagonal screws can ensure a stable connection between the Printed Circuit Board and the lever arm. Specifications: Material: ABS+Metal Model: S500 SK500 Wheelbases: 500mm Motor: 2212-3508 KV900-1100Kv Electric adjustment: 30Amp brushless Recommended battery: 11.1V-14.8V 2200-2600mAh Propellers: 9443-1245inches Package Includes: 1x S500 SK500 Quadcopter Frame Kit note: The packages are all loose part and need to be installed by yourself. Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.