Description: - Flybarless Head System provides 15% more power and less part of Trex 250.Precision CNC aluminum with cool Silver anodizing colors.High quanlity bearing. Includes: -CNC Aluminum Main Blade Grips-CNC Aluminum Center Hub-CNC ALuminum Flybarless Swash Anti Rotation Link-Hardened Spindle Shaft-All hardwares Requires: -Loctite (#242 is recommended)-Assembly Weight: 8.5g Usage: -T-REX 250 helicotpers Instruction: -Included in the package Features: 100% Precision CNC machined Aluminum and Delrin Pre-assembly 4 precision miniature bearings Using Head Button Delrin Insert for light weight Special reduced OD Steel Washer to prevent friction to outer ring of bearing Light weight designs, strong and stylish Use metal ball system to ensure zero slop performance