Features: Enhances your helicopter performances with the 550mm Universal Glass Fiber Main Rotor Propellers. Designed to reduce noise and power loss, these propellers provide stable flying and exceptional durability. Crafted from high quality glass fiber material, these propellers are strong and resistant to crashes, ensuring long lasting use. Experience smoother flights, reduced noise, and enhanced control. Perfect for helicopter enthusiasts of all skill level, these universal main rotor propellers are a must have accessory for anyone looking to improve their flying experience. Whether you're practicing in an open field, these main rotor propellers will deliver stable and reliable performances, making every flight a memorable one Specifications: Material:Glass Fiber Total length:Approx.568mm/22.36in Tip to hole length:Approx.550mm/21.65in Paddle width:Approx.53mm/2.09in Root thickness:Approx.12mm/0.47in Aperture: Approx.4mm (with brass sleeve) Package Includes: 1pair 550mm Main Propellers note: Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.