Thunder Power RC 325mm Carbon Fibre Rotor Blade Set with Shims for 400-450 Size Helicopters Unique carbon fiber and foam core construction results in incredible stiffness for unbelievable stopping power and response High-quality resin and "painted in the mold" finish offers great looks and visibility; both on the ground and in the air 21-gram weight (each blade) offers the perfect balance of stability and response sought by low-time and extreme 3D pilots alike Offer all the looks and performance of top-brand blades at a fraction of the price Adult supervision is required