Kokuyo Campus Notebooks Semi B5-dotted, 6mm Ruled and 1.5mm Sub-dotted Graph Style - 30 Lines X 30 Sheets - Pack of 5 Cover Colors Semi B5-dotted, 6mm Ruled and 1.5mm Sub-dotted Graph Style - 30 Lines X 30 Sheets Based on famously known "Todai-note: Tokyo University Notebook", customized to graph style by adding 1.5mm sub-dot. Perfect for drawing diagrams. Great notebooks for learning mathematics, physics, and more! Practical notebook to draw graphs and figures Made in Japan / High-quality paper / Wireless Binding