Packaging | Promotional Products | Books, Catalogues & Promotional Material | Corporate Stationery | Graphic/Web Design & Pre-Press Post-it® Flag Pens/Highlighters << go back Post-it® Flag Highlighter Pens are available with a yellow barrel and yellow highlighter. Printing allows for one print position on the pen only. Post-it® Flag Pens are available with a black barrel and black ballpoint. Printing allows for one print position on the pen only.