Align DS515M digital servo Features: High rigidity shock resistant metal gears. Coreless Motor Design for fast speed high efficiency and low power consumption. 10 Bits signal resolution for smooth movements. Fast speed with high torque of 5.0kg/cm. High strength composite alloy gears with durable structure characteristics. Aluminum alloy mid case construction for instantaneous heat dissipation maintaining servo?s high efficiency. Supports digital & analog control signal. Powerful and precise servo suitable for T-Rex 500 CCPM cyclic use. This package includes: Servo rudder piece x 2 Set screw x 1 Rubber damper x 4 Brass grommet x 4 Socket button head tapping screw(T2.6x12mm)x 4 D5AF Servo horn x 4