The standard size of this servo is very popular.
It is affordable and easy to use.
 
[ SPEC ] 
Torgue : 45.8 oz-in / 3.2kgf-cm @4.8V
Speed : 0.23 sec 60 degrees
Weight : 2.54oz / 44g
Operation Voltage : 4.8v to 5.5V
Size:  37.5 × 19.0 × 38.5 mm
● Analogue
● Plastic gear
Recomennd for sports flying airplanes.RC cars