Introduce and reinforce numbering, ordering, and sequencing skills with the most popular accessory for Unifix cubes. The 1-10 stair consists of a series of 10 vertically grooved columns, each numbered with a value at the top. Placing cubes to match each numbered groove, students demonstrate each number as a grouping of ones. The stair is made of durable plastic and measures 8-1/2" x 8-7/8". Cubes are not included.