This item is an and portable pen, which is made of durable and smooth plastic what makes this pen full of is the special function of invisibility, the words will disappear from the paper where you wrote. It will be existed after you illuminate it with the UV-light which is on the pen cap. The UV-light can also be used as currency detector._x000D__x000D_Features_x000D__x000D_- Color: 4 Colors mixed._x000D_- Material: Plastic._x000D_- Size: 13 x 1.5 x 1cm._x000D_- Safe and flavorless ink, you can write everywhere: T-shirts, paper, skin and any surface Healthy toys for your kids and environmental pens _x000D_- When your message is written by the pens, nothing you will see, but you can see message clearly with light from the of the pen._x000D_- Perfect for the RSVP& 39;s to wedding invitations, Good accessories for kids spy party, Make a fun party favor, even using the UV light to check currency._x000D_- Made of premium plastic material, lightweight and appropriate size, easy to carry._x000D_- Can also be used as birthday gifts, Halloween gifts, Christmas presents to friends._x000D_- Warm Tip: Dear buyer, Due to lighting effect, monitor’s brightness, manual measurement and etc., there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand Thank you _x000D_Packing list:24 x Invisible Ink Pen