Check the listing for details. Invisible Ink Pen with UV Flashlight LED Black Light Reactive Secret Marker Set. Color: Blue, Condition: New. Listed at 7.94 USD. Invisible Ink Marking Pen and LED UV Light with Keychain Features Glows bright cyan blue under UV black-light (included) Use to secretly mark valuables Write hidden messages, entertain, and much more Mark wedding invitation for RSVP Every pen comes individually packaged in a cellophane bag Non-toxic and environmentally friendly Condition New in package Shipping Will ship by US Postal Service with tracking number Usually ships within 24 hours of received payment Contact Please feel free to message us with any questions or concerns Thanks for your time and consideration Powered by SixBit's eCommerce SolutionInvisible Ink Marking Pen and LED UV Light with Keychain Features Glows bright cyan blue under UV black-light (included) Use to secretly mark valuables Write hidden messages, entertain, and much more Mark wedding invitation for RSVP Every pen comes individually packaged in a cellophane bag Non-toxic and environmentally friendly Condition New in package Shipping Will ship by US Postal Service with tracking number Usually ships within 24 hours of received payment Contact Please feel free to message us with any questions or concerns Thanks for your time and consideration Powered by SixBit's eCommerce Solution