This colorful, mess-free activity book is perfect for on-the-go fun! Fill the included pen with water and use it to color the pictures. Water will reveal vibrant colors and amaze children. Let the page dry, watch the colors disappear and do it all again! Each board also has search & find activities and an educational fact for even more fun! This spiral bound book includes 4 reusable picture boards and 1 refillable water pen. Measures 6" x 9.75", for ages 3 and up. NOTE: Water Reveal boards may warp after several uses. After completing each activity page, use a towel to remove any excess or residual water. Not intended as a bath or pool toy.