HeroFiber 12 Invisible Ink Pen with UV Light and 12 Dog Patrol Notebook Set. Party Favors for Kids 8-12, Escape Room Party Favors, Goodie Bag Stuffers for Kids 8-12, Spy Party Favors

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.

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.

Perfect theme for a fun party favor, for drawing, secret message writing, currency checking, security marking.