The material includes ten parallelepipedons with square section of 3x3 cm and an increasing length from 10 to 100 cm. The rods are made of solid wood with blue varnish finishing.
This material encourages the freedom of choice and concentration. It sharpens the visual perception by educating the sense of sight related to the length as well as the ability to distinguish differences. Moreover, it develops the ability of seriation and gives the child important keys to its environment, expressed on various levels, including the logical-mathematical level. It prepares directly for writing through the work that has to be carried out from left to right.