MukikiM SpyX / Invisible Ink Pen - Write and Read Invisible Messages with This Fun Spy Toy.  Perfect addition for your spy gear collection! Your child can use the Invisible Ink Spy Pen to write, read, and share invisible messages with fellow secret agents. Use the UV light to reveal the top secret spy message. And it has a Secret compartment to secure your secret paper supply! Big ergonomic pen design comfortably fits your junior agents grip. Collect all SpyX toys for the ultimate spy play experience.