JR S8911BL Brushless HV XBus Servo. All Alloy Case
Specifications: 
@6.6V 51.7kg-cm    Speed: 0.15 sec/60゜
@7.4V 58.0kg-cm    Speed: 0.13 sec/60゜
@8.4V 65.8kg-cm    Speed: 0.11 sec/60゜
Weight: 79g
Dimensions:  40.5mm x 20.5mm x 40.0 mm
All AlloyCase
**** Servo Arm Not Included!