Hobonichi Graph Notebook - A5 SizeNotebook Details This graph paper notebook is made with Tomoe River paper, opens completely flat, and the printing comes in four different colors across the book. This notebook has 288 pages and uses the same 3. 7mm graph paper as the A5 Hobonichi Techo. The color of the ink on the page changes every 72 pages (red blue green purple), making it easy to split the book into several themes or use the colors as a way to more easily find old entries. The