Futaba 46 mm servo arm with ball link. It weights 3,5 g. The high torque of modern digital servos meke's necessarie this type of servo arms. It's made in high density plastic with carbon fiber (nylon with 45% carbon fiber content) .The result of its manufactured is a high-strength component, which can be compared with Duralaluminium, but supports better the vibrations. It's manufactured in Germany using the latest CNC machines.