This is the Futaba S3110 7.7g Micro Servo with J Connector.

FEATURES: Compact dimensions and light weight is ideal for Park Flyers and
small electric aircraft
Replaceable case set and gears

INCLUDES: One Futaba S3110 Micro Servo with J Connector

SPECS:    Length: 0.9" (21.8mm)
Width: 0.4" (11mm)
Height: 0.8" (19.8mm)
Weight: .27oz (7.7g)
Speed @ 4.8V: .10 sec/60°
Torque @ 4.8V: 22 oz-in