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Write Your Secret Message: This magical invisible ink pen will help you write your secret message. Once your secret message has been written with this invisible ink pen, shine the built-in UV light from the pen's cover and reveal the secret message. Unique Spy Pens: Filled with the invisible ink, truly invisible to the naked eyes to keep your secret and mark your personal items. Can be used on any surface like t-shirts, paper, skin and much more.Fun Activity: Ideal for a variety of fun activities such as party favour, treasure hunt, escape room party, birthday party, detective spy games, scavenger hunt, class breakout and so on. Perfect goodie bag fillers for New Year’s Day, Easter Day, Halloween, Thanksgiving Day, Christmas's Day and other parties. Dimension: 13 cm. Each pen is individually packed (As shown in picture). Colors of pen sent randomly. Popular among all age group: children, teens, students.