This is the Savox SB-2290SG Black Edition Monster Torque Brushless Steel Gear High Voltage Servo. The Savox Monster Torque servo utilizes a unique brushless motor and controller technology to boost power up to 35% over previous generation servos.

Features:

• Full Aluminum Case
• 3 Precision Ball Bearings
• Brushless Motor
• High Voltage
• Up to 972.1oz-in of torque!

Specifications:

• Torque:
• • @6V: 45.0kg-cm (624.9oz-in)
  • @7.4V: 55.0kg-cm (763.8oz-in)
  • @8.4V: 70.0kg-cm (972.1oz-in)
• Speed:
  • @6V: 0.16/60° sec
  • @7.4V: 0.13/60° sec
  • @8.4V: 0.11/60° sec
• Dimensions (LxWxH): 40.3x20.2x38.7mm
• Weight: 81.0g