The 18 inch L. box has 10 compartments and the hinged lid has 10 corresponding slots. A header strip is placed in the back and the tiles are dropped in the proper slots. The set includes 4 header strips: one with numerals in correct sequence on one side and domino patterns in out of sequence order (for more difficult matching) and 2 color strips. There are 50 counting tiles, 20 color tiles, and 2 wooden storage boxes. Ages 3 yrs. +.