Help children develop an understanding of how things work. Two different sized free-rotating wheels allow for an exciting variety of models. Children learn how to grab, pull and push their models, which helps with their coordination and synchronizes movement. Included picture guide shows how to build different vehicles. Make all sorts of models; hot rod, tractor, bus or racing car! Includes 4 Giant Polydron Squares, 8 Giant Polydron Equilateral Triangles, 16 Gear Squares, 2 Small Wheels and 2 Big Wheels. Ages 2 and up.