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Build your own robot arm from scratch with this Hydraulic Robot Arm DIY set allows you to build yourself a cool robot and take a closer look at how hydraulic power works Set consists of 229 plastic pieces to fit together to make robot arm Once completed test out skills by moving objects around, enjoying precise movements you have created Powered by hydraulic power – not batteries 6 axis of movement controlled by levers Illustrated instructions included Great way to keep kids occupied on a rainy day Save 23% with this Hydraulic Robot Arm for 22.99 pounds