This is the Hitec HS-55 Sub Micro (Feather) Servo with a Futaba J, Hitec S, JR, Airtronics Z-type Connector.

FEATURES: Very slim case and lightweight for mounting in small airplanes, electrics or gliders, where very high speed and good torque are critical. One of the slimmest micro servos available. High-strength resin gear train provides reliable operation.

INCLUDES: One HS-55 Servo w/pre-installed small X-shaped servo horn and screw One very small straight servo horn One M1.7x3 servo horn screw One small straight servo horn Two M1.7x7 servo mounting screws at 4.8V

SPECS: Speed: 0.17 sec at 60° Output Torque: 15.27 oz-in (1.1 kg-cm) Weight: 0.27oz (7.8g) Length: 0.89" (22.8mm) Width: 0.45" (11.6mm) Height: 0.94" (24mm) ir/jl updt  

BOX DIMENSIONS: 1.88" W. X 1.75" H. X 2.50" L. BOX WEIGHT: .04 LBS.