JR S390 DS390 Digital Precision Micro Metal Gear Servo This is the JR Radio DS390 Digital Precision Micro Metal Gear Servo.Features:Ultra precision electronicsThin and lightweightClass-leading torque and speedDurable metal gear trainIdeal for performance electrics, sailplanes and pylon modelsJR Radios DS390 digital precision micro metal gear servo gives you zero deadband, class-leading holding torque, and the legendary high resolution of JR Radio servos in a package tha