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

Specifications:

• Water Resistant: Yes
• Input Voltage: 6v-8.4v
• Internal: Precision Metal Gears/All CNC Brass Casing
• Bearing Type: 2BB
• Weight: 1.27oz/36G
• Dimension: .90 x .47 x 1.08 (LWH)
• Torque:
  • @ 6.0V: 89oz
  • @ 7.4V: 99oz
  • @ 8.4V:115oz
• Speed:
  • @ 6.0V: .11sec
  • @ 7.4V: .09sec
  • @ 8.4V: .08sec
• Spline: 25T MICRO   
• Dead Band Width: 2¦Ìs
• BEC: Not Required