An incredible hydraulic arm that you can build to discover the amazing laws of mechanics and engineering! With over 250 components, you can construct a hydraulic arm that you control through a system of pistons and colored liquids, allowing it to reach for, lift, and move objects. Build more than 20 types of hydraulic machines and explore the principles of hydraulics by operating fantastic constructions that follow your commands. The detailed instructions guide the child through the building process and help them understand the fundamentals of engineering, physics, and mechanics.