This is the Hitec HS-56HB Feather Sub Micro Servo designed for use with park flyers, high performance electric models and gliders up to 2 meters.
FEATURES: Ball bearing Karbonite gears Upright or flat mounting tabs Compatible with Futaba J, Hitec, JR and Airtronics Z receivers
INCLUDES: One servo with Hitec S style Connector and pre-installed 1" 4 arm servo horn One 1" (25.4mm) long single arm servo horn One 1-3/8"(35mm) double arm servo horn Four 3/8" (10mm) long screws (for mounting the servo into your model)