This storage box is designed to hold your wooden perpetual calendar month cards and coins (sold separately) of your wooden home calendar, so that you have an organized place to keep them. It is carved from solid maple wood. There is plenty of space for holding additional coins if you decide to add to your set--such as the moon phases and holidays. You can also request blank coins for making your own, perhaps chores/rhythms to place onto the calendar. Please note that months cards from our classroom calendar won't fit into this storage box.