This set includes 12 decks of cards with 24 cards in each deck. Each deck has its own sea creature so that when that one card shows up randomly, you can easily identify which deck it belongs to (YAY for no digging around!).
Simply print each file double-sided on card-stock, cut out the cards and you are ready to go. Each deck has two pairs of the same note/staff picture from middle C to G on top of the staff. I hope your kiddos enjoy!