JR Propo S8944S Servo, Brushless, Full Alloy Case, Metal Gear, xBus
Specifications: 
@6.6V 43.2kg-cm    Speed: 0.10 sec/60゜
@7.4V 48.5kg-cm    Speed: 0.09 sec/60゜
@8.4V 55.0kg-cm    Speed: 0.08 sec/60゜
Weight: 79g
Dimensions:  40.0mm x 20.0mm x 40.5 mm