This Dagu 6 Degrees of Freedom Robotic Arm is made from 3mm thick aluminum sheet and uses 4x DGServo S06NF STD servos for the base and the arm. It also has 2x DGServo S05NF STD micro servos operate the wrist and gripper. A serial interface and PC software is included. The 6 degrees of Freedom allows the arm to move into many positions. This is a great entry level arm to studying servo and kinematic movements.