Engage in some spy fun with the Secret Message Kit! This exciting set allows you to exchange hidden messages with friends, using invisible ink markers to safeguard your secrets. Watch as messages appear magically under the cap blacklight! You can also learn how to create personalized secret codes for added mystery and intrigue. With two notepads and two invisible ink markers, this kit encourages creativity, critical thinking, and endless hours of entertainment. Package measures 6'' wide x 9'' high.