This is 2K version of S3911.
 
stall torque : 17.8kg-cm＠6.6V / 20.0kg-cm＠7.4V / 22.7kg-cm＠8.4V 247.2oz-in＠6.6V / 277.7oz-in＠7.4V / 316.6oz-in＠8.4vspeed： 0.12sec (60 degrees)weight：37.8g　size：26.5mm x 15 x 33angle：120°/180° voltage： 5.4v 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 valtage
■ Doble ball bearings (10x6) bottom(10x6)
■ full metal case
■ Coreless motor
■ CNC arm(not include)