pack of 2 spy pen (pink). Magic Pens: A secret message is written with this invisible ink pen, only can you see it until shining it over where you wrote. Very interesting and bring fun for kids. Built-in UV Light: The spy pens have the UV light installed in the cap so you don't need to buy a spare light, which also comes with battery in it, very convenient to use. Safety Invisible Ink Pens: Harmless and flavorless ink, you can write everywhere: T-Shirts, paper, skin and any surface. The inks is durable but washable. Very safety to use. Widely Used: The pens also can be used widely. Perfect for the RSVP's to wedding invitations, goody bags for kids spy party, make a fun party favor, secret message writing, security marking which really bring happiness to all of us. So we all can't miss these fun products.