HD900A 900 Carbon Fiber Blades / 3 (Special order)Product: HD900A 900 Carbon Fiber Blades 3 For remote control helicopter use. Instruction: Specification: 3K Carbon Fiber Material. 900 Carbon Fiber Main Blades are specially designed for professional agricultural helicopter. 900mm total length and semi symmetrical airfoil design offer optimal buoyancy for heavy payload flight. Moreover, its super lightweight and rigidity features that can effectively improve the torsion resistance during heavy payload