AeroXcraft X50 Black Aluminum Arm for DJI F450, F550, TBS Discovery AeroXcraft's high quality upgrade for DJI multi rotor arms used on the F450, F550 and TBS (Team Blacksheep) Discovery multi rotors. CNC machined from 6082-T6 aluminum and anodized in one of four colors: Red, Black, Silver (Natural) or Blue. Lighter, much stiffer and more durable than stock G10 arms, with integrated ESC mount. Includes velcro ESC holddowns. Acts as a massive heatsink for each motor - capable of dramatically cooling warm running engines (see picture) Engineered by AeroXcraft in the UK to withstand up to 9kg (19.8 lbs) load - fatigue tested at 9kg to 250,000 cycles!