This material consists of: a wooden box with nine compartments and lid contains 10 stairs of 1-9 beads; a smaller box with two compartments and lid contains twenty 10 bead bars and a stair of black-white beads; a wooden tray with easy grip. The beads have a diameter of 8 mm and are micro lathed and varnished in Italy and thread on stainless steel wire by hand. Other wooden parts have a UNI EN 71-3 finishing.
This material can be used from the age of 4 onwards when the child knows the the golden bar of tens, the numbers 1 to 10 and the coloured bead bars. To be used with the positive snake game, first and second level. The goal of this material is to facilitate the construction of the mental calculating mechanism by using the 10.