Here's the way to mark your place in your book! Bookmarker Pens are the world's slimmest retractable pens. Save the page. Save the hassle of scrambling for a pen. Light weight and slips easily, trimly over a page and your pocket. Ideal place marker and pen for diaries, checkbooks, questionnaires and phone book. Perfect for mailing to a friend as gentle reminder that you're owed a letter.