The water magic abc set contains a water pen that kids can use to reveal the hidden answers containing six reusable boards this pad is a great visual way to encourage your little ones writing skills and number recognitionline up the pen with the dotted lines to reveal the number then reveal the two pictures that represent the amountsharpen your kids skills wherever you go from long journeys to grey and rainy days at home wait for the boards to dry to use them all over againfor ages three