Three years & up. What an inventive way to experience colors, shapes, and numbers! 18 inch box has 10 compartments and a lid with corresponding slots. Follow one of the included header strips and slip tiles through appropriate slots. Includes four number sequence strips, 2 color sequence strips, 50 counting tiles, 20 color tiles, and a wooden storage box. Measures 18″L x 2 1/2″H x 6 1/4″W.