It is stronger and lighter than copper.

MG92B
You can not find more valuable servo than MG92B ever! small size but with 3.5kg  powerful torque.
MG92B is metal gear, digital,3.5kg torque, double ball bearing and with alloy case in the middle.
It is a great choice for Jet, airplane, helicopter.

Specification:

Weight: 13.8g
Dimension: 22.8x12x31 mm
Stall torque: 3.1kg/cm (5.0v); 3.5kg/cm (6.0v)
Operating speed: 0.13sec/60degree (5.0v);0.08sec/60degree (6.0v)
Operating voltage: 5.0~6.6v
Gear Type: Metal gear
Bearing: Double ball bearing
Servo case: Middle with alloy case
Temperature range: 0- 55℃
Servo case: Middle with alloy case
Servo Plug: JR (Fits JR and Futaba)
Dead band width: 1us
servo wire length: 25cm
servo arms &screws included &fit with Futaba&JR servo arm
It’s universal “S" type connector that fits most receivers, including Futaba, JR, Hitec ,GWS, Cirrus, Blue Bird, Blue Arrow, Corona, Berg, Spektrum.
CE &RoHS approved

We have upgraded our servo gear set and shaft to aluminum 6061-T6.