ROTORTECH 450mm CARBON BLADES EPSpecifications: Length: 450mm Width: 45mm Grip: >8mm Hole: 3mm Airfoil: Semi Symmetrical Tip: Curved Make: Carbon Fiber Common Application: 500 Size Electric RC Helicopters (e.g. Hirobo ® Lepton , Align® T-Rex 500) Includes: 1x pair of RotorTech™450mm carbon fiber blades. 4x 0.5mm washers. 1x 3D/holographic decal sheet. RotorTech™ Standard Features: Safety wire runs alone the inner core of the blade. This keeps the blades in one piece upon a crash to insure safety to pilots and bystanders. Low parasitic drag coeficient due to the efficient airfoil and top quality clear resin finish, insures more engine power is transferred for lift, speed and more crisp maneuvers. High density D-Spar of Carbon Fiber mixed with a special resin absorbs all high-g spanwise loading. Designed for your 3D performance. Mathced C.C.G. for stability. Matched outward S.C.G. for better autos. Airfoil designed for fast, accurate cyclic. Layered for optimum aerodynamic damping.