Fill the tray with sand or cornmeal so children can practice making letters or numbers. Show the child how to trace a Sandpaper Letter or Numeral and then try to reproduce it in the tray. A gentle swish of the tray and the child can try again. Deep sides help contain the sand, and the lid prevents accidental spilling when the tray is not in use. Edges extend for easy carrying. Made of lacquered pine. 13½" x 10¼" overall; 1¼" deep.