Delfonics Rollbahn Note Notebooks are a more compact version of the classic Rollbahn. These notebooks are thin, staple-bound and are easy to slip into a pocket or bag. The sheets are high-grade paper that have a 5mm grid design and are fountain pen friendly that makes it easy for perforation and clean removal. Delfonics is one of Japan's most respected stationers whose products are highly sought after. Like many aspects of Japanese culture, Delfonics' products reflect attention to detail and design individuality. These come in four different sizes: A6 Pocket (4 in. x 6 in.); B6 Large (5.5 in. x 7 in); A5 (6.5 in. x 8.5 in.); B5 XLG (7 in. x 10 in.). Ideal for bullet journaling.