ZOOB 0Z11175 ZOOB Challenge Moving Mind-Building Modeling System, Assorted Colors, 175-Pieces
With the Zoob Challenge, Kids design and build cool, wacky creations to solve challenges, such as hitting targets and making balls bounce.  There are multiple possible solutions for each challenge.  Helps kids learn and apply scientific principles.  Set includes 175 classic Zoob pieces, plus wheels, elastic bands, and other building materials.