This is the Savox SC0252MG Metal Gear Digital Servo.

Features:

• 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.

Dimensions: 40.7x19.6x39.4mm
Weight: 49.0g
Speed: .19sec/60 @ 6.0V
Torque: 145.8oz-in @ 6.0V
Gear: Metal
25 Tooth Spline
Bearing: 2 Ball Bearings