The stair is the most popular accessory in the Unifix range. It consists of ten joined vertical grooves in which joined rods of Unifix Cubes are placed to match the values printed at the top of each groove. Cubes placed in the grooves demonstrate each number as a grouping of ones. Ideal for reinforcing and teaching number, ordering, and sequencing. The stair is made of durable plastic and measures. Cubes are not included.