BONNYCO Invisible Ink Pen and Notebook Pack 16, Dinosaur Party Favors for Kids.
There are a total of 16 magic pens with 4 different color casing: red (x4), orange (x4), blue (x4) and green (x4). SUPER FUNNY – With these fun pens for kids they can write secret phrases or drawings in the notebooks that can only be discovered by shining the pen’s ultraviolet light on them.