All SN Series servos all feature brushless motors and 4096 steps of resolution giving ultra precise control and low current draw. The SN Series servos feature a machined inner and outer middle case which locates directly on the brushless motor to provide cooling, increasing efficiency and strength. With the inner upper part also having been machined this adds additional cooling and provides a very sturdy foundation for the drive train supports. Also features O Ring seals between case sections and even on the retaining screws. High Voltage series are suitable for between 6.0v and 8.4v Direct Lipo