This 5 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.
Kids love them for writing secret messages & notes to each other, students can highlight text books and still sell the book when they finish their coursework.
Push the button to open the UV light for viewing your invisible messages
Size: 13cm x 1.8cm/5.12'' x 0.71'' (Approx.)