This is the Futaba Ball Bearing S9001 Servo.
This servo has one servo horn attached, three extra servo horns and mounting hardware.
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.
Final gear has a single ball bearing for fast transit time. Coreless motor for smooth and fast response. Ideal application for airplanes, sailplanes, helicopters, nitro or electric powered boats. Nylon gears