This HXT900, one of the most famous and the best value micro servos available.

Size : 21x12x22 mm / 0.74x0.42x0.78 in 
Voltage : 3v ~ 6v 
Weight: 9g / 0.32oz 
Speed : 0.12 sec/60(4.8V) 
Torque : 1.6 kg-cm 
Working Temp : -30C~60C 
Teflon Bushing, 15cm wire, coreless motor
Servo arms & screw included

These servos can be found on eBay at close to this price, however we offer a no quibble replacement service should you have any problems! HexTronik (the manufacturers of these servos) have two standards, one is for local sale, and the other is export quality with imported connectors and resin gears from Taiwan and Japan.