Reefs RC 99micro High Torque/Speed Metal Gear Digital Micro Servo. 

Specifications

• Waterproof: Yes
• Input Voltage: 6v-8.4v
• Internal: Precision Metal Gears / All CNC Alum. Casing
• Bearing Type: 2BB
• Weight: .70oz
• Dimension: .90 x .47 x 1.08 (LWH)
• Torque: 89oz @ 6.0v / 99oz @ 7.4v / 115oz @ 8.4v
• Speed: .11sec @ 6.0v / .09sec @ 7.4v / .08sec @ 8.4v
• Spline: 25T MICRO   
• Dead Band Width: 2¦Ìs
• BEC: Not Required