Mark your personal property discreetly with our Invisible Ink I.D. Pen & UV Light. This pen allows police to detect, identify and return stolen property fast in the event of a burglary. You simply mark your valuables with your name and phone number or some other ID number. This pen will mark all surfaces including glass, paper, wood, plastic and cloth with permanent, invisible ink. Under ultraviolet light the marks become clearly visible to police, detectives, and pawn shop owners. One pen will mark over 1,200 valuables.