feature:1. Kid Lovers: Kids love to keep secrets and play detective spy games with this pen. Magic Pencil brings you all kinds of fun activities. Her parents or grandparents revealed top-secret information at a surprise party.2. Perfect gift: Different colors make the event more exciting and interesting. Parents can buy gifts for their children as gifts. Teachers can buy it for school events.3. Harmless and Odorless Ink: You can write anywhere: such as T-shirts, paper, skin and any surface. Healthy toys and eco-friendly pens for your kids.4. Wide usage: Perfect for RSVP wedding invitations. Great gift bag for kids spy parties, fun parties, or even checking dollar bills with lights. Bring you amazing fun, great for kids and friends.5. Best use: When your message is written on the pen, you can see it, but you can see it through the light on the top of the pen.Notice:Please allow 1-3cm deviation due to manual measurementDue to different monitors and lighting effects, the actual color may be slightly different from the imagedescribe:Material: Reusable PlasticDimensions: as picture showninclude:4X ink pen