Children will develop an understanding of how things work with this set. There are two different sized wheels which allow for an exciting variety of models. Children will learn how to grab pull and push their models which helps with their co-ordination and synchronises movement. The set comes complete with a picture guide which shows how to build different vehicles.Make all sorts of models such as a hot rod a tractor a bus or a racing car! The easy to use freely rotating wheels add a new dimension of movement to this very popular product. Big wheels are 36cm across!This 32 piece set contains 4 Squares 8 Equilateral Triangles 16 Gear Squares 2 Small Wheels and 2 Big Wheels.Sides of square measure 21cm. Age 2+.