This is an optional Align 120 Main Blade Set. Combine these with the green tail blades (AGNHQ0203B), to make your helicopter stand out on the bench, and in the air! This package includes two sets of bright green main blades. Specifications: Shape: Symmetrical wing Length: 120mm Weight: Approx 6g/set Includes: (4) Main Blades (1) Main blade decal set