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EcoPower's WP173 aluminum digital micro servo is high voltage, waterproof and fast. It's built for 1/16 and 1/18 scale rigs, including Traxxas, Axial, Losi and every Arrma Grom 1/18 platform. Running a Traxxas TRX-4M? It fits too, but you'll need the EcoPower CNC-machined aluminum servo mount (ECP-3072), sold separately. The guts are tough. Full metal gear, ball bearing support, aluminum case. High strength, high voltage, high torque and high speed. PERFORMANCE: At 6 volts: 0.09 seconds per 60, 123 ounces per inch of torque At 8.4 volts: 0.07 seconds per 60, 173 ounces per inch of torque Quick response for racing or technical moves where you need precise control.