Use for T-Rex 550E helicopter. The 550 3G main blades are designed specifically for extreme 3D flying, featuring both high agility and excellent stability characteristics. The blades have a 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, reducing blade noise and power loss.