Family Set - Numerical RodsThe purpose is to let kids experience the quantities of each number and to learn their respective names, to show that each number is represented by a single object This series of rods develops visual discrimination of length, while height and width remain constant, it can teach kids to count from 1 to 10 through the rods The ten solid wooden rods are constant in height and width (2 cm), while increasing in length in equal units from 5 cm (short) to 50