The tiny, lightweight HexTronik HXT900 Servo is ideal for foamies, park flyers or 450 siez electric helicopters. It is the same size as the popular Hitec HS55 micro servo, and delivers tight and solid centering along with high performance. The servo has a universal connector which will work with Futaba, JR or Spektrum Receivers. Features high-quality connectors and resin gears. (Gears are easily replacable should you suffer a harsh mishap).