The Precision CNC Aluminum Main Rotor Hub w/Button is designed to improve stability, durability and overall performance on the Blade mCP X helicopter. It's directly replaced the stock plastic main rotor hub. The Precision CNC Aluminum Main Rotor Hub w/Button is machined with high tolerance from aircraft aluminum to achive the best possible accuracy and precision. More than that, the Precision CNC Aluminum Main Rotor Hub w/Button is technically re-engineered with the closed loop rotation arms to improve cyclic position timing and prevent losing linkages during hard 3D maneuver on Blade mCP X flybarless head system.And yet, the Precision CNC Aluminum Main Rotor Hub w/Button is lightest weight design in its class only 0.44gram. The Precision CNC Aluminum Main Rotor Hub w/Button design will bring the best overall performance and the stylish head button look to your Blade mCP X helicopter.