The Spartan's clean, modern hull design is built up in layers for maximum rigidity where it matters most, the transom and ride pad. Lightweight yet incredibly strong, Spartan's ABS hull is designed to withstand the stress of high-voltage brushless horsepower, without the weight penalty of a fiberglass hull. The transom bulkhead also incorporates bosses for the trim tabs, turn fins, rudder support, and drive strut, eliminating the need for additional hardware inside the hull. In the Spartan's bow, moulded foam is form-fitted to the interior, adding security as it further stiffens the hull. Outside the hull, Spartan impresses with its wild factory-applied graphics—a Traxxas trademark.Extreme Velineon brushless horsepower delivers the muscle you want with the reliability you expect from Traxxas. The VXL-6s Marine electronic speed control is built for true 6S LiPo power. * On-board low voltage detection helps you maintain your batteries. The extra voltage and current maximizes the potential of the Velineon 540XL motor for extreme 50+mph speed. The sensorless Velineon 540XL motor is designed for high-rpm performance and reliability with ultra high-temperature sintered Neodymium magnets, a precision-balanced rotor, and efficient, high-speed ball bearings. Cooling water is routed through the innovative speed control case and then into a unique sealed motor jacket that allows cooling water to flow directly against the motor for maximum possible heat transfer. The Spartan keeps its cool, run after run, for trouble-free all-day fun. Required To Complete 2x NiMH battery packs: 6-18 cells (7.2 to 21.6 volts) or 2x LiPo battery packs: 2-6 cells (7.4 to 22.2 volts) AA batteries for transmitter Battery charger