This servo is the upgraded version of the servo, with metal gear instead of plastic gear, provides much better stall torque.

Specifications:
Brand: Wltoys
Suitable for: Wltoys 12428 RC Car
Dead band: 2μs
Working frequence: 1520μs / 330Hz
Operating speed (4.8V): 0.12sec/60°
Operating speed (6V): 0.10 sec/60°
Stall torque (4.8V): 3.35 kg.cm
Stall torque (6V):  4.52kg.cm
Dimensions: 35.5 * 15 * 30mm
Connector wire length: about 130mm
Bearing: 2BB
Weight: 25.65g

Package information:
Package size: 5.5 * 4 * 2cm / 2.2 * 1.6 * 0.8in
Package weight: 26g / 0.9oz
Polybag package

Package list:
1 * Wltoys 12428 Upgraded Servo