S8911 case and gear as is
It contains a new design NAMIKI brushless motor for better response.  
It has the same power and speed as the 8911 Coreless servos. 
30% reduction in  heat during use. 
Recommended for Aerobatic planes and Jets up to 120cc.
[Stall Torque]   
         28.3kgs  (6.6V) / 31.7kgs  (7.4V) / 36.0kgs (8.4V)kg・cm
         392.8oz (6.6V) / 440.4oz (7.4V) / 499.9oz (8.4V)oz・in
[Speed]
         0.13 (6.6V)/0.12 (7.4V)/0.10 (8.4V) Sec/60°
[Weight]
79 g / 2.79 in
[diemension]
40 x 20 x 41.05 mm
[Length of lead harness]
300mm
[Operating Voltage]
4.5V - 8.5V
■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)■wide valtage
■Brushress motor
Almost same size as S8911 . Easy to fit ARF mount size. Because OLD JR design was 21mm but our new design is 20mm.<Best setting for super light Airplanes Ex .3D airplanes IMAC airplanes . Jets and composite small control surface >Holding +5Dumping +20Dead band 0Boost +100 to 200You can adjust by JR TX or Our New programmer .
Stock setting is OK. But you can get more good feelings if you adjust.
 
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.