1 RANDOM COLOR - This spy pen is the top secret way to write! Write a top secret message with the invisibility ink, and reveal it with the UV flash light! You can use this in two fun ways. First, one end of the pen has a functional ball point pen when you want to write things for others to see. Open the cap to use a clear marker that writes invisibly, the only way to see the message is to shine the light that is attached to the pen! Approx. 6" long Includes a built-in flashlight to expose the message. Each pen has two tips, the clear ink (invisible) and the ballpoint pen tip. 2 Markers 3.5" long Includes a flashlight keychain to expose the message. Flashlight is 1.35".