Each medium pattern block is 5mm thick solid plastic. Universally accepted material for number relations, pattern making, fractions, tessellations and symmetry. While children of all ages use these materials enthusiastically. Complete with six shapes and six colours (yellow hexagons, orange squares, green triangles, red trapezoids, blue parallelograms, tan rhombuses). Set contains: 25 x hexagons, 50 x trapezoids, 50 x rhombus, 25 x squares, 50 x triangles and also 50 x parallelograms. Pattern blocks set contains 250 pieces.