Futaba S3115 Micro Precision Servo FEATURES: Ideal for electric planes and small electric helix Nylon gears One year warranty INCLUDES: Futaba S3115 Micro High Torque Servo One 1 (25.4mm) 4 arm servo horn (installed on servo) One 1.5 (39mm) 4 arm servo horn REQUIRES: Installing in aircraft and connecting to receiver