Remarkably smooth, thin and resistant, Tomoe River paper has earned a loyal following among writers and writing enthusiasts around the world. It is especially popular with fountain pens, as it can tolerate virtually any ink without running or bleeding through. Tomoe River paper from Sanzen is used for this writing pad. A successor to the original Tomoe River paper from Tomoegawa, this paper has the same excellent characteristics that made the original so popular. Comes with a double-sided guide sheet (6 mm squared and 12 mm ruled) that is placed under the sheet to facilitate writing in straight lines.