Description: -The Aluminum Main Rotor Hub for Blade MSR is designed to improve the stock plastic main rotor hub. This system not only reduces the chance of broken main rotor hub but also provides a new great look for your blade MSR. Includes: -CNC aluminum main rotor hub -All screws Requires: -Loctite (recommend #242) all the screws. Weight: 0.1g Usage: -E-Flite Blade MSR Instruction: -Included in the package