Montessori Number Rods are made up of ten wooden rods that are separated into units by alternating red and blue colours, going from 10 cm to 100cm in ten equal steps. This is one of the most important math materials in a Montessori environment. Your child is introduced to numbers 1 through 10 and their accompanying number names using the Number Rods. We provide 10 wooden number swatches. Our Montessori Number Rods are made from Imported plywood and coated with non-toxic water-based paints.