This robotic arm is an easy to make 3-dimensional model that demonstrates a hydraulic power system. The arm uses some of the same principles that drive real world machines - it grabs, lifts small items horizontally and can turn very close to 90 degrees! Great for STEM learning and a fun way to learn about Robotics, Levers & Simple Machines, Fluid Dynamics, Engineering & Invention – or just moving things around the house (small things, mind you – no pets please). Made from die-cut plywood, the frame is precisely cut and can be assembled in 1-2 hours. Standing at 14-inches high, and stretching up to 19-inches, the hydraulic arm needs no battery, simply add water to put it to the test! Suitable for ages 8 years & up and adult hobbyists.