This is hard-pen calligraphy paper from the Nihon Kyoiku Shodo Kenkyukai (Japan Education Calligraphy Research Association). Photo 2: Hard-pen paper E, 4 loose sheets and a bundle (46 sheets) Photo 3: Hard-pen paper D, 1 loose sheet and a bundle (49 sheets) Photo 4: Hard-pen paper E, the previous type, slightly yellowed. Offered specifically as practice paper, 2 books (100 sheets) Thank you for looking.