<p><strong>HeroFiber Invisible ink pens</strong></p><p>1. Write down secret information with a pen. Don't worry about being seen</p><p>2. Non toxic and tasteless ink is a safe toy for children</p><p>3. Can be used on T-shirts, paper, skin and any smooth surface, permanent but washable!</p><p>4. Children will love these spy pens</p><p>5. Use this pen to keep secrets and play detective games</p><p>6. Perfect gift for children and friends.&nbsp;</p><p>This fine point marker, is loaded with special ink that is only visible under UV light. It includes a mini LED UV black light with batteries, so you can view your messages.</p><p>Children think that they are secret agents with these pens, lay mystery adventures and writing clues for each other. You can make secret messages with your friends. The pens also can be used widely.</p><p>Perfect for theme of a fun party, for drawing, secret message writing, currency checking, security marking. It is a great gift for your lover, family and friend.</p><br>