Leuchtturm helps you get organized with numbered pages and a blank table of contents in each book and a set of stickers for the cover and spine that allow for clear labeling and archiving. High quality 100 gsm paper ensures that fountain pens and roller balls can be used without bleeding through the page. Thread-bound binding allows notebook to lay flat. The Slim Master, thinner and lighter than the Master, holds your oversized papers and fits nicely in your laptop case for travel. Includes 8 perforated, detachable sheets and expandable pocket inside back cover. Page marker and elastic closure.