The Graded Geometric Figures Montessori material includes three stackable wooden boxes, each with three compartments containing ten circles, squares or triangles in sizes from 1 cm to 10 cm and colours of red, blue and yellow.  The figures are made of a thick, durable plastic which are smooth on one side and lightly roughened on the other.  The boxes stack securely one on top of the other, and the top one has a lid making the complete set easily storable without taking up much shelf space.