These are the one of the best wing type servo that you can find in the market. With the aluminum hull look these servos are born to out perform competition. These might be mini servos but they pack a punch of 5.56Kgs torque at 6V. What else can you ask for more.

FEATURE:
● High performance programmable digital servo
● High-precision Taiwan-made aluminium gears with hard anodizing
● Full CNC aluminium hulls and structure
● Dual ball bearings

SPECIFICATIONS:
● Dead band: 3μs
● Operating Voltage:  DC4.8~6.0 V
● Operating Speed (4.8V): 0.11sec/60 degrees 
● Operating Speed (6V): 0.13 sec/60 degrees 
● Stall Torque (4.8V): 4.51 kg.cm (62.64 oz/in)
● Stall Torque (6V):  5.56 kg.cm (77.23oz/in)
● Dimensions: 30X10X30 mm /1.18 X0.39X1.18 in
● Weight:  22.5 g (0.79oz)
● Connector Wire Length: JR  185 mm (7.28in)  
● Bearing: 2BB