Tungsten Heavy Alloy Aerospace Counterweight

With many advantages over conventional balance materials such as steel or lead, tungsten alloy counterweights are often used in Flight Control Systems to optimize the performance of flight control surfaces, such as rudders, elevators and ailerons.
Secondly, as helicopter rotor blades demand perfect balance, so tungsten heavy alloy can be utilized in Rotor Blades to compensate for any imbalances built into individual blades during the manufacturing process such as helicopter balance. 
Thirdly, tungsten alloy counterweights are incorporated into the pitch control system of many propeller designs as a fail-safe device to prevent over speed.