Perfect Pass Monster - As seen on YouTube by creators and RC enthusiasts! The "MONSTER" by Perfect Pass is the ideal solution for anyone looking to purchase a professional servo that is the best of all worlds at a reasonable price..(professionals choice!). Super High Torque - True 56KG! Ultra fast under load Waterproof, Shockproof, Brushless & Metal Gears + Metal shaft. Extremely precise, High Voltage 6V-8.4V Efficient heat sink aluminum case for better cooling.