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The HS-35HD Ultra Nano servo offers unprecedented durability thanks to an exclusive Metal-Karbonite gear train. Delivering maximum performance at minimum weight, the HS-35HD is an industry favorite. Its long life and uniquely engineered gear train makes it one of the most reliable and efficient “tiny” servos on the market. The HS-35HD is perfect for micro 3D and sport aircraft as well as many small helicopters.