Perfect for helicopter enthusiasts of all skill, these main rotor propellers are a must have accessory for anyone looking to improve their flying Whether you ' re practicing in an open field, these main rotor propellers will deliver stable and, making every flight a memorable Crafted from glass fiber, these propellers are strong and resistant to crashes, ensuring long lasting use Enhances your helicopter with the 550mm Glass Fiber Main Rotor Propellers Designed to reduce noise and power loss, these propellers provide stable flying and durability smoother, reduced noise, and enhanced control