Suitable for both indoor and outdoor use, the pieces in this set are made from super tough plastic and are safe, durable and lightweight. This Giant Polydron Cogs Set contains 24 squares, 4 equilateral triangles, 10 gear squares and 20 gears. 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! Standard delivery times may not apply to this product. Please contact Customer Care if you require further information.