The brightly colored, transparent material is ideal for light tables or any white surface. Place the Challenge Cards in the pocket of the tray. Position the circle wedges in the tray to solve the challenges. You can layer the wedges to create new colors. This product is enjoyable for a wide range of ages. Included in the package: 1 Tray (8 x 15½”), 24 Circle Wedges, and 24 Challenge Cards (3½ x 3½”). Ages 4+