Wagner Zip Change flat, rigid sign letters use screen printed inks on clear thick plastic panels and are for use on outdoor reader boards and marquee signs. Zip Change letters are clear coated to help protect the ink from peeling and fading. Letter Perfect offers several styles and many sizes of these changeable copy letters for your readerboard. To change sign letters from the ground, check out our Zip Changer, Mr Longarm or Pronto Change Arm extension poles with suction cups.