Nishinouchi-gami is a yellowish brown thick paper made of pure kozo in the Nishinouchi, Naka-gun, Hitachi Province in the upper reaches of the Kuji-gawa River, it is sturdy and can be preserved for a long period.
西の内紙は、常陸国の久慈川上流地域の那珂郡の西の内で漉かれた、純楮紙で黄褐色の厚紙で、丈夫で保存性が良い紙である。