Turn your whiteboard, or any magnetic surface, into a marble run! Set features 14 foam pieces in various shapes and sizes. Arrange the pieces according to one of the 10 activity cards, or create your own design - then drop a marble from the highest point and see if it makes it to the destination. Terrific for problem-solving activities and engineering practice. Includes 4 marbles and a 3-sided goal piece. Largest foam piece measures 10x2". For Kindergarten and up.