S9254 High Speed Ball Bearing Nylon Gear Digital Standard Servo from Futaba - FUTM0224
The Futaba S9254 is a high speed digital standard helicopter gyro servo for that also works well for 2000mm wingspan and larger airplanes, turbine powered jets, and 700 to 800 helicopters. Comes with a coreless motor. Don't settle for cheap imitations. The S9254 is a powerful standard-sized servo more than up to the task.
Features:

Coreless motor which is lighter and results in smoother operation and faster response time

Digitally enhanced microprocessor cuts about half of the response time from transmitter input to servo reaction
Dual ball-bearings
High speed
Black plastic case
Dust and water resistant (not waterproof)
One year warranty

Includes:

1x S9254 high speed ball bearing nylon gear digital standard servo
1x round servo wheel
1x six arm servo horn

1x four arm servo horn

1x grommets
1x mounting screws
1x rubber mounts.

Tech Note: This digital servo cannot be used with the following * AM * transmitters as the servo neutral signal is: 1310us). CONQUEST AM, FG Series (T4FG, T5FGK,T6FG, T6FGK, T7FGK), New Terratop, T3EGX, T3PGE, T2NL, T2LGX, T2FR, T2PK series. For full performance use with FM, PCM and HR systems.