This is 2K version of S3911.
 
stall torque : 13.4kg-cm＠6.6V / 15.0kg-cm＠7.4V / 17.0kg-cm＠8.4V 185.5oz-in＠6.6V / 208.0oz-in＠7.4V / 236.1oz-in＠8.4v
speed： 0.18sec/60deg.@6.6v / 0.16sec/60deg.@7.4v / 0.14sec/60deg.@6.6v@8.4v
weight：1.20oz / 34g　
size：26.5mm x 15 x 33angle：120°/180° voltage： 6.0v to 8.4v
■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 voltage
■ Double ball bearings (10x6) bottom(10x6)
■ full metal case
■ Coreless motor
■ CNC arm(not included)