This is the Tower Hobbies Single Ball-Bearing Standard Servo with Universal Connector for Cars, Aircraft or Boats. FEATURES: Standard size allows for installation in most applications. Powerful motor and molded gear train provide trouble-free operation. Ball bearing output shaft for better deadband and less slop. Z connector is compatible with any Futaba "J", Airtronics "Z", Hitec "S" or JR receiver without modification. One year warranty INCLUDES: One servo with small wheel(horn) One large servo wheel (horn) One six-arm servo horn One four-arm servo horn Four brass eyelets Four mounting screws Four Rubber Grommets (rectangular) SPECS: Speed: .22 sec/60° Torque: 42 oz-in Weight: 1.5oz (42g) Length: 1.59" (40mm) Width: 0.77" (19mm) Height: 1.4" (35mm) COMMENTS: WARNING, never allow the Red (+) and Black (-) wires to cross on any receiver or servo. Permanent damage will result to both components. Wire Color Codes- Black: Ground Red: Positive White: Signal JXS 9/19/00 ir/jl ir/jxs