Suitable for RC beginners, the F550 features a simple design with a built-in circuit board for ESC power distribution. It has few parts and a strong structure, making maintenance easier for users. The mounting holes are compatible with various controller boards such as KK and FF, meeting different user needs including FPV applications. Recommended Combination: Motor: 2216/2814 800KV-1000KV ESC: 20A-30A Battery: 4S 2000mAh-3600mAh Lipo Size: 550MM (Wheelbase) Weight: 448g Note: The thickness of the four motor arms is 5mm. Use M3x8 screws for motor mounting. Color: As shown Material: Plastic Package Contents: 1 x FPV F550 Hexa Frame Arm Only the above package content is included; other items are not included. Note: Light reflection and differences in display screens may cause slight variations in color between the image and the actual item. Measurement allows an error of +/- 1-3cm.