Align 500 4-Blades Flybarless Main Rotor Head Set. Main Shaft Diameter: 8mm (not included). Use For Trex 500 RC Helicopter. 1 x Align 500 4-Blades Flybarless Main Rotor Head Set. The item “Align Trex 500 4-Blades Flybarless Main Rotor Head Set” is in sale since Friday, January 3, 2020. This item is in the category […]