This servo falls into between S8911BL and S8955SS.  It produces enough torque yet it keeps speed at 0.08 at 8.4V.  It has very good potential to be your almighty servo.
 
[ Stall torque]     43.2 (6.6V)/48.5 (7.4V)/55.0 (8.4V)kg・cm
　　　　　　　600.1 (6.6V) / 672.9 (7.4V) / 763.8 (8.4V)oz・in
[Speed] 0.10 (6.6V)/0.09 (7.4V)/0.08 (8.4V) Sec/60°
[Weight] 79 g / 2.79 in
[Dimension] 40 x 20 x 40.5 mm / 1.38 x 0.79 x 1.59 in
[Cable length] 300mm 
[Operational voltage] 4.5V – 8.5V 
■High performance brushless motor
■programmable Neutral, endpoint,gain etc(Works with PWM XBUS)120°150°180°(Works with PWM XBUS)Synchronize(Works with PWM XBUS)
■Super steel full metal gear(Gear B brass)
■BIG upperl ball bearing (12x6) bottom(10x6)
■Special desigen Brushress motor
■full metal gear
■full metal case
■wide voltage
■double ball bearings　Φ12 / Φ10
■angle：120°/180°（150° can be set by XBUS SERVO PROGRAMMER）
※ servo arm not included
 
Important Notes on Using Our Servos
Our servos are programmed to operate with high precision and sensitivity.
Because of this, if there are any obstructions within the servo’s range of motion and it is unable to move as commanded by the transmitter, the servo may experience excessive load. This can result in damage to the internal circuit board due to overheating.
When installing the servo for throttle, aileron, or other control surfaces, please make sure to leave a small amount of free play between the servo travel range and the mechanical movement range. This helps prevent any binding or overloading of the servo.
 
The firmware in a 2k servo verifies the position of the servo arm two thousand times each second, 
while the firmware found in previous servos verify the arm's position one thousand times per second.
This greater number of verifications makes for a very precise servo, and gives it a more "solid" feel.
It is recommended to use a booster cable with 2k servos to ensure steady voltage at all times.