The E-Flite Lower Main Blade EFLH1221 BCX is a set of new 4pc propellers specifically designed for E-Flite helicopters. Made by the reputable brand Blade, these black propellers are compatible with E-Flite models for precise and reliable performance. Perfect for hobbyists looking to replace worn out or damaged blades, this product ensures smooth operation and stability during flights. Ideal for enthusiasts who value quality and compatibility in their RC model vehicle parts. Please use the close up features and pictures to get a better idea of what you might be receiving. If you have any questions please feel free to ask. Thank you for looking.