Magic Water Cards by Floss & Rock are perfect for little hands and exploration of letters, numbers, and colors. Fill the pen with water, and color in the pictures to watch designs magically appear and then disappear when dry. Can be reused again and again and stored away in the handy case. Cover case measures 7.4 x 7 x .7 inches, and the 10 inner cards measure 5.9 x 5.9 inches. Construction theme