Long Stairs / Red Rods is a set of 10 rods that demonstrate a single change in dimension, i.e., the length. While the height and width remain constant at 2.5cm, the length varies from 10cm to 100cm. The purpose of these rods is to develop the sense of visual perception as well as the muscular perception of length. Our Montessori Long Stairs/Red Rods are made from Imported plywood and coated with non-toxic water-based paints.