These 520mm main blades are specifically for 3D up to extreme 3D flying, featuring both high agility and excellent stability characteristics. The blades have brand new airfoil design, coupled with new painted graphics. In addition, the blades' rigidity has been increased for better anti-torsion characteristics during flight. The new airfoil design effectively minimizes turbulence at the blade tips, increasing efficiency by reducing blade noise, and lowering power loss.