This is a Hitec Super Torque, Metal Gear, that will work with Futaba J, Hitec S, JR, and Airtronics-Z radio systems. FEATURES: EPA, Speed, Direction, and Fail-Safe Programmable (see COMMENTS). MOSFET amplifier. Gold plated contacts. Three metal gears Dual ball bearings. Indirect drive long life potentiometer. High standing torque. Watertight and dustproof. Includes blue aluminum, heat-treated servo arm (see COMMENTS). Works with fixed wing aircraft and helicopters up to 40 pounds, 1/10th and 1/8th on- or off-road vehicles. INCLUDES: One digital high torque servo with 12" wire and S/JR/Air-Z connector One white small X-shaped servo horn. One red Large X-shaped servo horn. One white adjustable servo horn. One white offset straight servo horn. One white disc servo horn. One blue anodized, heat treated servo arm horn. Four 2 x 14mm mounting screws Four brass eyelets Four black rubber vibration isolators.