Ripmax Quartz QZ505 Servo - Digital Coreless (0.05sec/6.73kg)This high quality, high performance servo is intended to appeal to discerning modellers that only want the best. It's all metal cases, ball race, coated metal gears, core less motor and digital amplifier provides the perfect solution to your servo needs. If thin and speed with a core less motor is what you need, this is the servo for you! The all metal case is CNC machined from solid Aluminium for the very best in strength and rigidity. Check through