Spektrum H3020 Servo Sub-Micro Digital High-Speed Heli MG SPMSH3020 This is the Spektrum H3020 Sub-Micro Digital High-Speed Metal Gear Helicopter Servo.The Spektrum H3020 features 22 oz-in of torque, 0.08-second transit time, and metal gears, making it the perfect combination of speed, weight, and holding power for 250- to 450-size helis.