These are the Century Carbon Main Blades 3D 600mm A-Tip. FEATURES: Designed for 3D performance Matched CCG for stability and matched outward SCG for better autos Airfoil designed for fast, accurate cyclic Layered for optimum aerodynamic damping INCLUDES: One set of A-TIP Carbon Blades 4 washers REQUIRES: Installation on aircraft SPECS: Length: 23.6" (600mm) CG: 23% Weight: 4.9oz (140g) Width: 2.2" (55mm) Grip Thickness: .47" (12mm) Hole: .16" (4mm) Airfoil: Symmetrical Washout: N/A Tip: Angled Common Application: .46-.50 size R/C helicopters