Features: brand new and high quality This is a economical, powerful, easy-to-use mechanical arm learning kit for Arduino. The interactive learning robot kit for teens to learn visual coding, building and programming. You can control the arm robot by computer that is connected with arm robot via USB cable, then you can send commands through the serial port to control it. Package contains complete parts, easy to assemble, just simply put the robotic arm together with screws included. The chassis is in the form of a disc, which makes the manipulator turn left and right more flexible and smooth. Fine cup bearings are used at the steering joints, which not only makes the steering more flexible, but also allows the steering of the steering gear to be at the same center. Package Includes: 1 Set Acrylic Robot Claw 1 Pack Screw 4 X MG90S Metal Gear Servos Specifications: Material:Acrylic Weight:213G Recommended Age:15-35 note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.