RCX MG-90S is a great servos for the price. Withstand plenty of hard hits and are fairly accurate. Perfect flap servos. If you have a sailplane and need great flap servos, buy them. Awesome price for Metal gears! Works great on 450 size rc helicopter.

http://www.myrcmart.com/rcx-mg90s-mi...og-p-3510.html

It is now for USD4.99 (discounted price).

Features

* Light weight high strength nylon casing
* Durable partially metal gear with one bearing
* Recommended for 200-450 size helicopters or light weight aircraft
* Different servo horns included for different application

Specification

* Dimensions: 22.8 x 12.2 x 28.5mm
* Operating Speed (4.8V no load): 0.1sec/60 degrees
* Operating Speed (6V no load): 0.08sec/60 degrees
* Stall Torque (4.8V): 1.8 kg/cm
* Stall Torque (6V): 2.2 kg/cm
* Temperature Range: -30 to +60 Degree C
* Dead Band Width: 5usec
* Operating Voltage: 4.8 - 6.0 Volts
* Weight: 13.4g