UPC 4010168024097 Ideal for becoming immersed in the world of mathematics. Numbers or arithmetical operations are printed on each side. Count forwards or backwards, and practice math problems. Building towers or doing first arithmetic these building blocks offer both possibilities. Two cubes can be written on with chalk the solution of a problem for example. Contents 15 cubes, two which can be written on with chalk, 2 pieces of chalk, sponge. Products are made from sustainably managed forests and controlled sources. Non toxic water based stain. Age 2 6.