Easy and effective form of crime prevention, simply mark your valuables with an impression that is invisible to the naked eye and is only visible with the use of a UV light (provided in the set) The box contains a Printy self-inking stamp with one dry ink pad, 10ml bottle of quick-drying UV ink, tweezers for setting the type, a tray of re-usable characters including letters, numbers and symbols and the ultra violet keyring light. Allowing a maximum of 4 lines, the stamp impression gives you plenty of scope to create text unique to you.