Smart Pen Loops The Pen Loop is not only extremely practical, but also a highly variable design accessory. With its self-adhesive surface, this pen loop is attached in the back cover of the book and keeps writing utensils handy with the strong textile rubber band - whether thin pencil or hexagonal twist pen No. 1. With the Pen Loop, your favorite writing instrument won't get lost, and at the same time it sets colorful accents. Because for every notebook or calendar from LEUCHTTURM1917 there is a matching Pen Loop in the same or contrasting color.