Construct ten out of this world machines and learn about the physics of levers and linkages. A battery powered motor box powers the models. Make a creepy slithering alien snake bot model with rotating arms and articulating tail. Build an alien insectoid bot that crawls on six legs. Create an alien raptor model with wings that move up and down. Assemble a cool grabber claw with a scissors mechanism. Make a bipedal alien robot model that walks on two legs. In addition build models of a pumpjack swinging device hopping alien frog bot roving dino bot with reciprocating arm and rolling alien dragon bot. A 28 page manual guides your model building and experiments with step by step illustrated instructions.