1) An integrated pen holder ensures that you always have a pen along with your notebook, saving you the embarrassment of asking someone for one. Works with any Pilot Frixion Ink pen (one pen & cloth is included) available on amazon making it easy to buy refills or replacement pens. 2) Write without worry of exhausting your pages as 100 erasable pages have been provided. Our pages are 192gm thick, smooth & premium paper like quality. Feels exactly like normal paper but hides all its magic internally.