This is the E-Flite 7.5 Gram DS75 Digital Sub-Micro Helicopter Servo

Specifications:
Size Category: Minis and Micros
Type: Digital
Torque: 17.2 oz/in (1.17 kg. cm) @ 4.8V
Speed: .11 sec/60 deg @ 4.8V
Dimensions (WxLxH): .45 x .90 x .94 in (12 x 23 x 24mm)
Weight: .26 oz (7.5 g)
Bushing Or Bearing: Bushing
Motor Type: Coreless
Connector Type: Universal
Gear Type: Nylon
Application: Micro and mini electric helicopters