Editorial Review This is the Savox SA-1231SG High Torque Steel Gear Digital Servo. Features: Combines leading edge technology with super high 12 bit (4096) resolution and unique steel gears. Super light-weight. Coreless motor provides extremely high speed, incredible efficiency, and low power consumption. Extremely strong unique steel gears ensure long-life and durability. The full aluminum case design not only looks good but also allows for cooler and smoother operating temps. Savox servos are totally green " from materials to production, these servos are environmentally friendly. Ideal for giant scale aircraft, monster truck, 1/8 scale. Dimensions(mm): 40.3x20.2x45.0Weight(g): 79.0Speed(@4.8V sec/60): . 18Torque(@4.8V oz-in): 388.8Speed(@6.0V sec/60): . 14Torque(@6.0V oz-in): 444.4Gear: Unique SteelBearing: 2BBCase: Full Aluminum25 Tooth Spline is compatible with Futaba servo hornsFrequency: 250-333hzPulse Width Frequency: 1520 Dimensions(mm): 40.3x20.2x45.0Weight(g): 79.0Speed(@4.8V sec/60): . 18Torque(@4.8V oz-in): 388.8Speed(@6.0V sec/60): . 14Torque(@6.0V oz-in): 444.4Gear: Unique SteelBearing: 2BBCase: Full Aluminum25 Tooth Spline is compatible with Futaba servo hornsFrequency: 250-333hzPulse Width Frequency: 1520