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The cylinder is the tank to hold in the moon dust. The two dots on the pusher are vacuums to collect the moon dust from the pusher when it gets to a certain height. Then it will go through the tubes and get trapped in the tank. Then when it comes back to you, you can take it out and do whatever you want with it. It is made of stainless steel because it can withstand heat and cold. It is 3.5ft by 2ft by 2ft. There is a backup battery, solar panels, and motors, but I could not find them in the toolbox. The robot is thinner than the design looks.