Heli Max Lead SH100 Servo, 1.9g, 85mm FEATURES: Replaces worn or non-functional servos (three required per helicopter) Two mount aft and one mounts forward of the main rotor to control all INCLUDES: 1.9G Digital Servo (key #28) REQUIRES: Mounting Screws and servo horn COMMENTS: This servo does not include any mounting screws or control horns; jxs 11/01/12 ir/jxs