This is the Savox SC0253MG Metal Gear Digital Servo.

Features:

• Budget Digital Upgrade
• Precision metal gears forms a strong and solid framework
• Strict production and quality control of plastic components ensures long life and durability
• Our servos are totally green – from materials to production, these servos are environmentally friendly.
• Ideal for 30 size airplane or steering on 1/8th scale buggies.

Technical Specification Dimensions(mm): 40.7X20.0X37.0 Weight(g): 59.0 Speed(@4.8V sec/60): .17 Torque(@4.8V oz-in): 55.5 Speed(@6.0V sec/60): .15 Torque(@6.0V oz-in): 83.3 Gear: Metal 25 Tooth Spline Bearing: 1BB Case: Plastic 25 Tooth Spline Frequency: 200-250hz Pulse Width Frequency: 1520