Xpert R3HV Quick Release High Speed Low Profile Brushless Servo.  

Features: 

• Brushless motor design provides extremely high speed, top efficiency, and low power consumption with 250+ oz-in torque at 8.4V
• Quick release connector for easy wiring
• Plastic lower case with center and top aluminum design
• 4096 resolution and SIC (Single Integrated Circuit) for the highest performance and durability.
• Light weight design
• All Aluminum case for the best thermal dissipation and durability.
• Strong Metal Gear
• Glitch-free
• Sophisticated error correction
• High-Speed, High-precision 12-bit AD converter and CPU calculation
• Fail safe
• Over current protection
• Over temperature protection
• Start sonorant
• Sanwa SSR mode compatible 

Specifications: 

• Dimensions: 40.8x20.2x26.8 mm
• Frequency: 200/333 Hz
• Range: 50~400 Hz
• Center Position: 1520us
• Speed:
• @6.0V: .070 sec/60°
• @6.6V: .063 sec/60°
• @7.4V: .056 sec/60°
• @8.4V: .049 sec/60°
• Torque:
• @6.0V: 180.62 oz-in/ 12.98kg-cm
• @6.6V: 198.07 oz-in/ 14.27 kg-cm
• @7.4V: 222.08 oz-in / 16 kg-cm
• @8.4V: 252.06 oz-in / 18.16 kg-cm