NOTE: This frame is suitable for 4-axle drone. STURDY MATERIAL: Sturdy material provides good resistance to damage, so the quadcopter has a certain degree of protection to accidental fall from high places. PCB BOARD: Main and top boards are PCB boards, which allows you to solder ESC to them directly. X-STRUCTURE: With more flexible and stable, X-structure is more suitable for race drone to reach high speed with forceful move. And the colored arms are used to keep you flying in the right direction. CONVENIENT: This frame is big enough to fit your drone, it can tuck away all the wires neatly. Also it's easy to install and use.