Reefs RC Triple5 High Torque Steel Gear Digital Servo.

Specifications:
Waterproof: Yes
Motor: HV Coreless
Gears: Steel
Bearing Type: Dual Bearing
Weight: 2.2 oz
Dimensions: 1.6x0.8x1.6" (LxWxH)
Torque: 500oz @ 6.0V / 555oz @ 7.4V
Speed: .20 @ 6.0V / .17 @ 7.4V
Spline: 25T
Dead Band Width: 2¦Ìs

NOTE: BEC Recommended. Do not power over 7.4V