This is a Standard Servo with a Ball Bearing on the output shaft.
This has a "J" connector and uses a nylon gears.

This servo can produce high-current draw from your batteries. If using NiMH or LiPo batteries, make sure they are capable of delivering sufficient amps.
FEATURES: Single Top Ball Bearing
Same mounting as S148 and S9201 (individual rectangular grommets)
3-pole motor
Nylon gears

INCLUDES: One S3001 Standard Servo One accessory package
SPECS: Torque: 33.3 oz-in at 4.8V 41.6 oz-in. at 6V
Speed: .28 sec/60¦ @ 4.8V .22 sec/60¦ @ 6V
Length: 1.6" (41mm)
Width: .8" (20mm)
Height: 1.4" (35mm)
Weight: 1.6oz (45.1g)