The Hydraulic Arm is a great way to get kids to enjoy mechanics. This cool set comes with 229 pieces for you to put together. Once complete, you have a mechanical arm that you can control with a suction cup, gripper and wrist rotation. It has elbow, shoulder and base rotation all using hydraulic power with a max weight lift of 50g. Hydraulic powered DIY science kit with 6 axis of varied movements - powered by water. Includes DIY robot arm building kit - 229 assembly parts. Made from plastic. Size H29.5, W41, D10.5cm. 132 grams. For ages 10 years and over. Choking hazard - small parts.