Kids love to build robots--they're one of the most popular creations young builders submit to our Online Gallery. Now, kids can invent their own ZOOB-Bots, with a pull-back motor and wheels that make their mechanical models roll. As their ZOOB-Bot lurches forward . . . the motion makes the eyes light up. This set teaches robot fans how to build 4 ZOOB-Bots we've designed, but kids (and grown-ups) can use their creativity to invent lots more. This set includes 50 ZOOB pieces, 4 wheels, a pull-back motor, and a replaceable battery for the light-up eyes.