Herofiber 12 Invisible Ink Pen With Uv Light And 12 Mini Top Secret Notebook Set. Party Favors For Kids 8-12, Escape Room Party Favors, Goodie Bag Stuffers For Kids 8-12, Spy Party FavorsHeroFiber Invisible ink pens 1 Write down secret information with a pen Dont worry about being seen 2 Non toxic a..