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. FEATURES: 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 One year warranty INCLUDES: One Futaba Ball Bearing S9001 Servo with J connector and one 0.83" (21mm) round servo horn, one 1.38" (35mm) servo horn, one 4 point 1.53" (39mm) servo horn, one 6 point 1.26" (32mm) servo horn, four rubber grommets, four 2mm x 11mm self-tapping phillips head screws and four brass eyelets. REQUIRES: Phillips screwdriver to mount servo. SPECS: Dimensions: 1.6 x 0.8 x 1.4" (1-9/16 x 13/16 x 1-7/16") (40 x 20 x 36mm) Weight: 1.7oz (1-11/16oz) (48g) Torque: 54 oz-in (3.9 kg-cm) @ 4.8V 72 oz-in (5.2 kg-cm) @ 6V Transit Time: 0.22 sec/60° @ 4.8V 0.18 sec/60° @ 6V Warranty: Futaba warrants this servo for one year against defects in material or workmanship. COMMENTS: If extra accessory bag is needed use Futaba part #FSH42 (FUTM3550). A note on coreless motors-a conventional servo motor has a steel core armature wrapped with wire that spins inside the magnets. In a Coreless design, the armature uses a wire mesh that forms a cup that spins around the outside of the magnet. This arrangement is much lighter resulting in smoother operation and faster response time. JXS 2/22/02 updt jxs 10/29/04