Children create a structure by assembling the easy to use squares and triangles. Cogs are added by simply pushing them into place. They ingeniously mesh together either on a flat surface or at an angle of 90 degrees. Once connected, just turn one cog and see the rest of them rotate! Suitable for both indoor and outdoor use, the pieces in this set are made from super tough plastic and are safe, durable and lightweight. Suitable for age 2