This is a pair of Thunder Tiger 600mm 3D Carbon Fiber Helicopter Rotor Blades.
Suit Raptor 50 etc

FEATURES: 

Ultra high degree of stiffness in flatwise bending and torsional directions. Symmetrical low drag airfoil and forward chordwise center of gravity for fast and stable flying

SPECS:    
          Length: 23.6" (600mm)           
          Chord: 2.3" (59mm)           
          Washout: None           
          Weight: 4.76oz (135g) approximate           
          Root Thickness: 0.47" (12mm)           
          Bolt Hole Diameter: 0.157" (4mm)           
          Airfoil: Symmetrical 
Do not operate above 2200 RPM