Pack Of 2 Spy Pen (Pink) /Magic Pens: A Secret Message Is Written With This Invisible Ink Pen, Only Can You See It Until Shining Over Where You Wrote. Very Interesting And Fun For Kids. Built-In Uv Light: The Spy Pens Have The Uv Light Installed In The Cap So You Don'T Need To Buy A Spare Light, Which Also Comes With Battery In It. Very Convenient To Use. Safe Invisible Ink Pens: Harmless And Flavorless Ink, You Can Write Everywhere: T-Shirts, Paper, Skin And Any Surface. The Inks Is Durable But Washable. Very Safety To Use. The Pens Also Can Be Used Widely. Perfect For The Rsvp'S To Wedding Invitations, Goody Bags For Kids Spy Party, Makes A Fun Party Favor, Secret Message Writing, Security Marking Which Really Brings Out The Fun. We All Can'T Miss This Fun Product.