This is a great general-purpose actuator for tiny mechanisms. 
The FS90 is a 9 g analog servo from FEETECH (formerly known as Fitec) 
that offers position control over a 120° operating angle for standard servo pulses between 900 µs and 2100 µs. 
As with most servos, the pulse range can be expanded to achieve an expanded operating angle, 
but the limits of this are not specified by FEETECH.

 

Weight 9g
Size 23.2mmx12.5mmx22mm  
Voltage 4.8-6.0V
Type Analog Micro 
Gear Train Plastic
Ball Bearing No
Lead Length 200mm 
Plug JR