This notebook is a horizontal ruled (0.26 inch (6.5 mm) width) using DP paper. It features a soft writing surface that is virtually no bleeding or bleeding. 6.5mm ruled 80 pages Perforated Product Size: H 4.9 x W 3.5 inches (124 x 89 mm), Thickness 0.2 inches (4 mm). What is DP paper... Design Fill Pocket Book Paper. It is resistant to bleeding and bleeding, and features a soft writing experience. This is an original paper with a balanced balance of thinness required for notebook paper.